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Daikin R71FUV1 Service Manual Download Page 48

Symptom-based Troubleshooting

Si20-701_B

41

2.6 Equipment Operates but does 

not Provide Cooling

Applicable Model

All models of SkyAir series

Supposed Causes

„

Wrong selection of model

„

Refrigerant shortage

„

Insufficient airflow in the indoor unit

„

Increase of high pressure

∗

In addition, the following errors may be conceivable
• Insufficient compression of the compressor
• Insufficient circulation of refrigerant
• Defective electronic expansion valve

Summary of Contents for R71FUV1

Page 1: ...Pocket Manual Service Diagnosis Si20 701_B...

Page 2: ...oduces Loud Noise or Vibration 49 2 10Equipment Discharges Dust 52 2 11Remote Controller LCD Displays 88 53 3 Troubleshooting by Remote Controller 54 3 1 Procedure of Self diagnosis by Remote Controll...

Page 3: ...sure Level HPS 148 3 26E3 High Pressure Abnormality HPS 150 3 27E3 Actuation of High Pressure Switch 153 3 28E4 Low Pressure System Abnormality 162 3 29E4 Actuation of Pressure Sensor 164 3 30E4 Actua...

Page 4: ...5JC Suction Pipe Pressure Sensor Abnormality 259 3 56L1 Outdoor Unit PCB Abnormality 261 3 57L1 Outdoor Inverter PCB Abnormality 263 3 58L1 Outdoor Unit PCB Abnormality 265 3 59L4 Overcurrent of DC Ou...

Page 5: ...to Refrigerant Shortage or Electronic Expansion Valve Failure 349 3 85U0 Refrigerant Shortage 352 3 86U1 Reverse Phase 358 3 87U2 Insufficient Voltage 361 3 88U2 Power Supply Voltage Abnormality 363 3...

Page 6: ...3 103UC Address Duplication of Centralized Controller 438 3 104UE Transmission Error between Centralized Controller and Indoor Unit 439 3 105UF Mis connection of Field Wiring 447 3 106UF System is no...

Page 7: ...Si20 701_B SkyAir Series vi...

Page 8: ...V100LVE R FUY1 R71FUY1 FA71FVEK R100FUY1 FA100FVEK R71FUY1 FH71BVE R100FUY1 FH100BVE R125FUY1 FH125BVE R71FUY1 FHC71KVE R100FUY1 FHC100KVE R125FUY1 FHC125KVE R140KUY1 FHYC140KVE R71FUY1 FV71LVE R100FU...

Page 9: ...35BVE R50GV1 FH50BVE R60GV1 FH60BVE R35GV1 FHB35FV1 R50GV1 FHB45FV1 R60GV1 FHB60FV1 R35GV1 FHC35KVE R50GV1 FHC50KVE R60GV1 FHC60KVE R35GV1 FHK35FV1 R50GV1 FHK45FV1 R60GV1 FHK60FV1 R GV1A R35GV1A FHC35...

Page 10: ...R100KUV1 FHYC100KVE R71KUV1 FUY71FJV1 R100KUV1 FUY100FJV1 R71KUV1 FVY71LVE R100KUV1 FVY100LVE R KUY1 R71KUY1 FAY71FAVE R100KUY1 FAY100FAVE R71KUY1 FHK71FV1 R71KUY1 FHY71BVE R100KUY1 FHY100BVE R125KUY1...

Page 11: ...40KUTALK FHYC140KVE R KUYALK R140KUYALK FHYC140KVE R KUYAL R125KUYAL FHY125BVE R125KUYAL FHYC125KVE R140KUYAL FHYC140KVE R125KUYAL FVY125LVE Series Outdoor Units Indoor Units R LUV1 R71LUV1 FAY71FAVE...

Page 12: ...25LUY1 FHY125BVE R71LUY1 FHYB71FV1 R100LUY1 FHYB100FV1 R125LUY1 FHYB125FV1 R71LUY1 FHYC71KVE 4 R100LUY1 FHYC100KVE 4 R125LUY1 FHYC125KVE 4 R140LUY1 FHYC140KVE 4 R71LUY1 FHYK71FJV1 R71LUY1 FUY71FJV1 R1...

Page 13: ...05FAVAL R140LUTAL FDYM06FAVAL R125LUTAL FHY125BVE R125LUTAL FVY125LAVE R LUTAL Twin R140LUTAL FHY71BVE 2 R140LUTAL FHYC71KVE 2 R LUTAL Multi Use R140LUTAL FHY50BVE 3 R140LUTAL FHYC50KVE 3 R LUYAL R125...

Page 14: ...4 5 R21NUV1 4 5 FHC21NUV1 4 5 R26NUV1 4 5 FHC26NUV1 4 5 R30NUV1 FHC30NUV1 R36NUV1 5 FHC36NUV1 5 R NUY1 R26NUY1 4 5 FDBG26NUV1 4 5 R26NUY1 4 5 FDMG26NUV1 4 5 R30NUY1 FDMG30NUV1 R36NUY1 4 5 FDMG36NUV1...

Page 15: ...24NUV2S R24NUV2S FDBT24PUV2S R30NUV2S FDBT30NUV2S R30NUV2S FDBT33NUV2S R36NUV2S FDBT36NUV2S R30NUV2S FDMG30NUV2S R36NUV2S FDMG36NUV2S R13NUV2S1 FH13NUV2S R18NUV2S1 FH18NUV2S R24NUV2S FH24NUV2S R30NUV2...

Page 16: ...NUY2S FDMG36NUV2S R42NUY2S FDMG42NUV2S R48NUY2S FDMG48NUV2S R51NUY2S FDMG51NUV2S R56NUY2S FDMG56NUV2S R48NUY2S FDMG48NVV2S R51NUY2S FDMG51NVV2S R56NUY2S FDMG56NVV2S R48NUY2S FDMG48PUV2S R51NUY2S FDMG5...

Page 17: ...V2S R30PUV2S FH30PUV2S R36PUV2S FH36PUV2S R30PUV2S FHC30PUV2S R36PUV2S FHC36PUV2S R PUY2S R30PUY2S FH30PUV2S R36PUY2S FH36PUV2S R42PUY2S FH42PUV2S R30PUY2S FHC30PUV2S R36PUY2S FHC36PUV2S R42PUY2S FHC4...

Page 18: ...Q140DV1 RR71MY1 FCQ71KVEA RR100MY1 FCQ100KVEA RR125MY1 FCQ125KVEA RR140MY1 FCQ140KVEA RR71MY1 FHQ71BVV1B RR100MY1 FHQ100BVV1B RR125MY1 FHQ125BVV1B Series Outdoor Units Indoor Units RY FUVAL RY71FUVAL...

Page 19: ...RY35FV1A FHYC35KVE RY35FV1A FHYK35FJV1 Series Outdoor Units Indoor Units RY GVAL RY50GVAL FHY50BVE RY60GVAL FHY60BVE RY50GVAL FHYC50KVE RY60GVAL FHYC60KVE RY GV1A RY50GV1A FHYB45FV1 RY60GV1A FHYB60FV1...

Page 20: ...RY71KUV1 FVY71LVE RY100KUV1 FVY100LVE RY KUY1 RY71KUY1 FAY71FAVE RY100KUY1 FAY100FAVE RY71KUY1 FHY71BVE RY100KUY1 FHY100BVE RY125KUY1 FHY125BVE RY71KUY1 FHYB71FV1 RY100KUY1 FHYB100FV1 RY125KUY1 FHYB12...

Page 21: ...YB71KAVE RY71LUV1 FDYM03FAV1 RY100LUV1 FDYM04FAV1 RY71LUV1 FHY71BVE RY100LUV1 FHY100BVE RY71LUV1 FHYB71FV1 RY100LUV1 FHYB100FV1 RY71LUV1 FHYC71KVE RY100LUV1 FHYC100KVE RY71LUV1 FHYK71FJV1 RY71LUV1 FUY...

Page 22: ...AV1 RY100LUY1 FDYM04FAV1 RY125LUY1 FDYM05FAV1 RY140LUY1 FDYM06FAV1 RY71LUY1 FHY71BVE RY100LUY1 FHY100BVE RY125LUY1 FHY125BVE RY71LUY1 FHYB71FV1 RY100LUY1 FHYB100FV1 RY125LUY1 FHYB125FV1 RY71LUY1 FHYC7...

Page 23: ...LUY1 FHYC50KVE 3 RY LUTAL RY140LUTAL FDYM06FAVAL RY140LUTAL FHYC140KVE RY140LUTAL FHY50KVE 3 RY140LUTAL FHY71KVE 2 RY140LUTAL FHYC50KVE 3 RY140LUTAL FHYC71KVE 2 RY LUVAL RY140LUVAL FDYM06FAVAL RY140LU...

Page 24: ...Q140B8W1B FCQH140C7VEB RZQ125B8W1B FDQ125B7V3B RZQ100B8W1B FHQ100BUV1B RZQ125B8W1B FHQ125BUV1B RZQ100B8W1B FUQ100BUV1B RZQ125B8W1B FUQ125BUV1B RZQ B8W1B Twin RZQ140B8W1B FAQ71BUV1B 2 RZQ100B8W1B FBQ50...

Page 25: ...ZQ140B8W1B FHQ50BUV1B 3 RZQ B8W1B Double twin RZQ125B8W1B FBQ35B7V1 4 RZQ140B8W1B FBQ35B7V1 4 RZQ125B8W1B FCQ35C7VEB 4 RZQ140B8W1B FCQ35C7VEB 4 RZQ125B8W1B FFQ35BV1B 4 RZQ140B8W1B FFQ35BV1B 4 RZQ125B8...

Page 26: ...EB RZQ140C7V1B FCQ140C7VEB RZQ71C7V1B FCQ71C7V3B RZQ100C7V1B FCQ100C7V3B RZQ125C7V1B FCQ125C7V3B RZQ140C7V1B FCQ140C7V3B RZQ100C7V1B FCQH100C7VEB RZQ125C7V1B FCQH125C7VEB RZQ140C7V1B FCQH140C7VEB RZQ7...

Page 27: ...B 2 RZQ100C7V1B FFQ50BV1B 2 RZQ125C7V1B FFQ60BV1B 2 RZQ71C7V1B FHQ35BUV1B 2 RZQ100C7V1B FHQ50BUV1B 2 RZQ125C7V1B FHQ60BUV1B 2 RZQ140C7V1B FHQ71BUV1B 2 RZQ140C7V1B FUQ71BUV1B 2 RZQ C7V1B Triple RZQ100C...

Page 28: ...50B7V3B RZQ C7Y1B Twin RZQ200C7Y1B FAQ100BUV1B 2 RZQ200C7Y1B FBQ 100B7V3B 2 RZQ250C7Y1B FBQ 125B7V3B 2 RZQ200C7Y1B FCQ100C7VEB 2 RZQ250C7Y1B FCQ125C7VEB 2 RZQ250C7Y1B FDQ125B7V3B 2 RZQ200C7Y1B FHQ100B...

Page 29: ...EB 4 RZQ200C7Y1B FFQ50BV1B 4 RZQ250C7Y1B FFQ60BV1B 4 RZQ200C7Y1B FHQ50BUV1B 4 RZQ250C7Y1B FHQ60BUV1B 4 Series Outdoor Units Indoor Units RZQG LV1B RZQG71LV1B FCQG71EVEB RZQG100LV1B FCQG100EVEB RZQG125...

Page 30: ...00KAVLT FBQ100DVET RZQ125KATLT FBQ125DVET RZQ140KATLT FBQ140DVET RZQ71KAVLT FCQ71KVLT RZQ100KAVLT FCQ100KVLT RZQ125KATLT FCQ125KVLT RZQ140KATLT FCQ140KVLT RZQ KB RZQ71KBV1 FAQ71BVV1B RZQ100KBV1 FAQ100...

Page 31: ...B7V3B FCQH71C7VEB RZQS100B7V3B FCQH100C7VEB RZQS71B7V3B FHQ71BUV1B RZQS100B7V3B FHQ100BUV1B RZQS71B7V3B FUQ71BUV1B RZQS100B7V3B FUQ100BUV1B RZQS B7V3B Twin RZQS71B7V3B FBQ35B7V1 2 RZQS100B7V3B FBQ50B7...

Page 32: ...C7VEB 2 RZQS140C7V1B FCQ71C7VEB 2 RZQS140C7V1B FCQH71C7VEB 2 RZQS125C7V1B FFQ60BV1B 2 RZQS125C7V1B FHQ60BUV1B 2 RZQS140C7V1B FHQ71BUV1B 2 RZQS140C7V1B FUQ71BUV1B 2 RZQS C7V1B Triple RZQS125C7V1B FBQ50...

Page 33: ...VV1B RZR HUY2S RZR30HUY2S FBQ30DV2S RZR36HUY2S FBQ36DV2S RZR42HUY2S FBQ42DV2S RZR48HUY2S FBQ48DV2S RZR30HUY2S FCQ30KV2S RZR36HUY2S FCQ36KV2S RZR42HUY2S FCQ42KV2S RZR48HUY2S FCQ48KV2S Series Outdoor Un...

Page 34: ...S FCQ42KV2S RZR48KUV2S FCQ48KV2S Series Outdoor Units Indoor Units RZY LV1 RZY71LV1 FAY71FAVE RZY71LV1 FHYB71FV1 RZY71LV1 FHYC71KVE RZY LVAL RZY71LVAL FAY71FAVE RZY71LVAL FHYB71FVAL RZY71LVAL FHYC71KV...

Page 35: ...s Outdoor Units Indoor Units CMSQ A7W1B Multi CMSQ200A7W1B CMSQ250A7W1B FMCQ50A7VEB FMCQ60A7VEB FMCQ71A7VEB FMCQ100A7VEB FMCQ125A7VEB FMDQ50A7V3B FMDQ60A7V3B FMDQ71A7V3B FMDQ100A7V3B FMDQ125A7V3B FMDQ...

Page 36: ...nt discharges dust Refer to P 52 10 Remote controller LCD displays 88 Refer to P 53 11 Equipment emits odor Room smell and cigarette odors accumulated inside the indoor unit are discharged with air In...

Page 37: ...e for several minutes after equipment is turned OFF 19 Horizontal swing sends air to different directions in cooling and heating even if it is set to the same position It is normal The airflow directi...

Page 38: ...ctive high pressure switch Defective magnetic switch for fan motor Activation or fault of overcurrent relay for fan motor Defective overcurrent relay for compressor Defective compressor protection the...

Page 39: ...3 min standby YES NO Normal Start up operation after 3 minutes 3 min standby YES NO Diagnose based on error code on remote controller YES NO Diagnose based on error code on remote controller Check th...

Page 40: ...t Compressor does not Operate Applicable Model All models of SkyAir series Supposed Causes Fuse blown or disorder of contact in operation circuit Defective thermistor Defective indoor outdoor unit PCB...

Page 41: ...efore connecting or disconnecting connectors or parts may be damaged Is the power switch OFF or the fuse for power switch blown Is the heating switch turned ON at outdoor air temperature 32 C 1 Is rat...

Page 42: ...Compressor Indoor unit PCB Outdoor unit PCB COMP Magnetic switch or power transistor Suction air thermistor Input to PCB Output from PCB Input to PCB e Output from relay or micro computer d Output fro...

Page 43: ...nt system Defective pressure switch Defective magnetic switch for outdoor unit fan motor Defective aux relay for outdoor unit fan motor Soiled heat exchanger of outdoor unit There is an interfering it...

Page 44: ...e based on the error code on remote controller Defective fan motor Check the magnetic switch and aux relay for fan motor Wireless Heating Indoor unit Cooling Outdoor unit YES Cleaning NO YES Remove th...

Page 45: ...ge of power supply Excess level of high pressure Insufficient size of power cable Defective compressor Compressor protection thermostat Compressor protection thermostat may act due to the following re...

Page 46: ...lace the power cable Check on the cause why overcurrent relay for compressor or compressor protection thermostat acted After vacuum drying charge correct amount of refrigerant Then start operation aga...

Page 47: ...nce between suction side and discharge side of four way valve Is there any temperature difference between inlet and outlet of electronic expansion valve NO YES Replace the electronic expansion valve N...

Page 48: ...els of SkyAir series Supposed Causes Wrong selection of model Refrigerant shortage Insufficient airflow in the indoor unit Increase of high pressure In addition the following errors may be conceivable...

Page 49: ...r temp Discharge air temp Wrong selection of model Affection of direct sun NO YES YES YES Check the each section Clogged air filter Soiled heat exchanger Defective fan motor Refer to troubleshooting A...

Page 50: ...igerant overcharge Air mixed in refrigerant system Soiled heat exchanger Short circuit of discharge air Disturbing item in airflow Defective outdoor unit fan motor Refer to troubleshooting E7 Check th...

Page 51: ...els of SkyAir series Supposed Causes Wrong selection of model Refrigerant shortage Insufficient airflow in the indoor unit Decrease of low pressure In addition the following errors may be conceivable...

Page 52: ...ive indoor unit fan motor Refer to troubleshooting A6 Measure the temperature of suction air and discharge air Temperature difference Discharge air temp Suction air temp YES Wrong selection of model A...

Page 53: ...each item Refrigerant overcharge Soiled heat exchanger Short circuit of discharge air Disturbing item in airflow Defective outdoor unit fan motor Refer to troubleshooting E7 Check the each item Insuf...

Page 54: ...B 47 2 8 Equipment Discharges White Mist Applicable Model All models of SkyAir series Supposed Causes Humid installation site Installation site is dirty and with dense oil mists Soiled heat exchanger...

Page 55: ...t NO NO Normal NO YES Cleaning of air filter Check the fan motor Refer to troubleshooting A6 Normal Mist is generated due to defrosting operation Is the airflow rate too small NO NO Did the trouble ge...

Page 56: ...ries Supposed Causes Improper installation Contacts of fan piping casing etc Noise of refrigerant flow Operating noise of drain discharge equipment Noise of resin components contracting In addition th...

Page 57: ...unting section NO YES Insert cushion materials to the pipe support such as saddle YES NO Disassemble and remove parts contact YES NO Correct piping manually or attach a dead weight to pipe YES NO Norm...

Page 58: ...NO YES NO Normal Operation sound of draining device YES NO Normal Creak generates by shrinkage of resin parts due to temperature change YES NO It is normal After vacuum drying charge correct amount o...

Page 59: ...he time of operation start again after extended period of operation Dust collected inside the indoor unit are blown out Cleaning for inside of indoor unit is necessary YES Is the air filter equipped D...

Page 60: ...he unit is checking to confirm that remote controller is normal Indication appears for short time YES Is the position of SS1 on indoor unit PCB at Emergency Turn the switch to Normal and reset power s...

Page 61: ...t kind of error caused operation to stop Note 1 Pressing the INSPECTION TEST button will blink the check indication 2 While in service mode holding down the ON OFF button for a period of 5 seconds or...

Page 62: ...ed for the particular model 1 Checking an error or warning Operation Status Display Abnormal shutdown The system stops operating The operation lamp green starts to blink The message Error Press Menu b...

Page 63: ...ireless Remote Controller If unit stops due to an error the operation indicating LED on the signal receiving part of indoor unit blinks The error code can be determined by following the procedure desc...

Page 64: ...n The left 0 upper digit indication of the error code blinks 4 Error code upper digit diagnosis Press the UP or DOWN button and change the error code upper digit until the error code matching buzzer 2...

Page 65: ...1 Press INSPECTION TEST button If no button is pressed for 1 minute equipment returns to normal status When MODE selector button is pressed or no button is pressed for 1 minute equipment returns to n...

Page 66: ...door Unit PCB Abnormality h h h h h h h 81 A3 Drain Water Level System Abnormality h h h h h 1 h h 83 A6 Indoor Unit Fan Motor Abnormality h h 1 h 86 A7 Swing Flap Motor Abnormality Lock h h h h h h 9...

Page 67: ...ty h h h h h h h 81 A3 Drain Water Level System Abnormality h h h h h 2 6 h h 83 A6 Indoor Unit Fan Motor Abnormality h 1 86 Drain Water Level System Abnormality h 3 h 1 88 Indoor Unit Fan Motor Abnor...

Page 68: ...1 h h 2 6 h h 112 Capacity Setting Abnormality h h 113 C1 Transmission Error between Indoor Unit PCB and Fan PCB h h 115 Transmission Error between Indoor Unit PCB and Adaptor PCB h 5 118 C4 Thermist...

Page 69: ...normality h h 145 E4 Low Pressure System Abnormality h h h h h 162 E6 Compressor Overcurrent h h 181 E9 Electronic Expansion Valve Abnormality h h h h 196 F3 Discharge Pipe Temperature Abnormality h h...

Page 70: ...Unit and Outdoor Unit h h h h h h 378 U5 Transmission Error Between Indoor Unit and Remote Controller h h h h h h h 404 U8 Transmission Error Between Main Remote Controller and Sub Remote Controller...

Page 71: ...42 E3 Abnormally High Pressure Level HPS h 148 High Pressure Abnormality Detected by the High Pressure Switch h h h 150 Actuation of High Pressure Switch h 153 Actuation of High Pressure Switch h 156...

Page 72: ...5 h 203 Electronic Expansion Valve Abnormality h 2 h 4 207 F3 Discharge Pipe Temperature Abnormality h 214 Discharge Pipe Temperature Abnormality h 216 Discharge Pipe Temperature Control h h h h 218 F...

Page 73: ...tor System Abnormality h h h 237 Thermistor System Abnormality h 248 J6 Heat Exchanger Thermistor System Abnormality h h 251 Thermistor System Abnormality h h h 237 J7 Thermistor System Abnormality h...

Page 74: ...ature Rise h 273 Radiation Fin Temperature Rise h 6 276 L5 Overcurrent of DC Output Instantaneous h 278 Momentary Overcurrent of Inverter Compressor h 6 281 Output Overcurrent Detection h 284 Inverter...

Page 75: ...321 Transmission Error between Control PCB and Inverter PCB h h h 4 5 323 P1 Inverter Over Ripple Protection h 6 h 326 Transmission Error between Control PCB and Inverter PCB h h h 4 5 h 329 P4 Radiat...

Page 76: ...frigerant Shortage h 348 Low Pressure Drop Due to Refrigerant Shortage or Electronic Expansion Valve Failure h 349 Refrigerant Shortage h h 5 352 Refrigerant Shortage h 4 354 Refrigerant Shortage h 3...

Page 77: ...or Unit and Outdoor Unit h h 384 Transmission Error Between Indoor Unit and Outdoor Unit h 388 Transmission Error Between Indoor Unit and Outdoor Unit h 4 5 391 Transmission Error Between Indoor Unit...

Page 78: ...ission Error Between Main Remote Controller and Sub Remote Controller h 417 Transmission Error Between Main Remote Controller and Sub Remote Controller h h h h 419 U9 Transmission Error Between Indoor...

Page 79: ...smission Error between Centralized Controller and Indoor Unit h 439 Transmission Error between Centralized Controller and Indoor Unit h 6 h 444 UF System is not Set yet h 448 Transmission Error Betwee...

Page 80: ...annot solve the error replace the fan PCB AH 03 Transmission error between the self cleaning decoration panel and the indoor unit when the self cleaning decoration panel is mounted Check for the conne...

Page 81: ...Check whether the capacity setting adaptor is correct and the type of the fan PCB is correct Error code Troubleshooting Description of error Description of diagnosis E7 01 Fan motor lock The fan moto...

Page 82: ...p This error is supposed to have resulted from instantaneous power failure liquid back etc Check and probe the cause L8 04 Thunder detection error Surges caused by thunder L8 05 Inverter limiting curr...

Page 83: ...en compressor and micro controller There is an error in transmission between the compressor and the outdoor unit PCB If the wire connections of the compressor are normal check for the same of the outd...

Page 84: ...r supply U2 03 Main circuit capacitor charge error There is abnormal circuit current flowing in the PCB If wire connections related to the PCB are normal replace the outdoor unit PCB U2 04 SP MP PAM o...

Page 85: ...outdoor unit UA 09 Indoor Outdoor transmission error between slave 3 and outdoor unit There is an error in transmission between the outdoor unit and slave indoor unit 3 Check for the connection of the...

Page 86: ...thod of Error Detection Detect open or short circuit between external input terminals in indoor unit Error Decision Conditions When an open circuit occurs between external input terminals with the rem...

Page 87: ...device Change the second code No to 01 or 02 Replace the indoor unit PCB YES External ON OFF input mode No 12 first code No 1 has been set to external protection device input second code No 03 by remo...

Page 88: ...ta from the E PROM is not received correctly E PROM Electrically Erasable Programmable Read Only Memory A memory chip that holds its content without power It can be erased either within the computer o...

Page 89: ...PCB The error may be caused by an external factor rather than damaged parts Locate the cause and correct the situation NO Normal reset Switch the power OFF and ON again to restart Caution Be sure to t...

Page 90: ...CQ FFQ FCQG FHQ option FHQG FAQ option FBQ FDQ FMDQ FUQ Method of Error Detection By float switch OFF detection Error Decision Conditions The error is generated when the water level reaches its upper...

Page 91: ...d check the voltage of the drain pump connector 220 240 VAC Is the drain water level abnormally high YES YES YES YES NO Replace the short circuit connector NO Connect the short circuit connector NO A...

Page 92: ...is detected by a PCB without X15A the PCB is defective Error displayed again NO YES YES Replace the float switch Is the float switch connected NO Connect the float switch Replace the indoor unit PCB...

Page 93: ...FDMG FAQ100BU FHQ BU Method of Error Detection Detection by failure of signal for detecting number of turns to come from the fan motor Error Decision Conditions When number of turns cannot be detecte...

Page 94: ...rectly With connectors unplugged and the power supply turned ON is there about 12 VDC between pins 1 and 3 of fan motor connectors NO YES Replace the indoor unit PCB Check the indoor unit fan motor an...

Page 95: ...increase Supposed Causes Defective indoor unit fan motor Breaking or disconnection of wire Defective contact Defective indoor unit PCB For FCQ C7 FAQ BU Disconnection short circuit or disengagement of...

Page 96: ...With connector for fan motor disconnected can the fan be easily turned by hands NO YES Replace the fan motor Turn OFF the power supply Wait for 10 minutes Check for the fan motor connector Is the resi...

Page 97: ...r Detection from the current flow on the fan PCB when the fan motor starting operation Error Decision Conditions An overcurrent flow The rotation speed is less than a certain level for 6 seconds A pos...

Page 98: ...rs between the indoor unit PCB and the fan PCB are disconnected YES NO Connect correctly The fan can be moved lightly by hand after the fan motor connector of the fan PCB is removed NO Replace the fan...

Page 99: ...nd W are unbalanced or short circuited NO Replace the fan motor Between VCC and GND terminals and between GND and HW HV or HU terminals are short circuited YES Replace the fan motor A Remove the power...

Page 100: ...roubleshooting by Remote Controller Si20 701_B 93 The HAP lamp of the indoor unit PCB blinks and the HAP lamp of the fan PCB is OFF Replace the fan motor YES Replace the fan PCB NO B Turn ON the power...

Page 101: ...which the separate power supply for the fan is cut OFF Error Decision Conditions Unable to detect that separate power supply for the indoor unit fan is turned ON Supposed Causes Defective power supply...

Page 102: ...ing connectors or parts may be damaged NO Is the fan interlock PCB correctly connected Connect correctly YES Is the operation normal It is supposed that the system caused abnormal stop due to overload...

Page 103: ...ls FMCQ FMDQ Method of Error Detection Detection by failure of signal for detecting number of turns to come from the fan motor Error Decision Conditions When number of turns can not be detected even w...

Page 104: ...indoor unit PCB Connect the wiring and turn ON again YES Fix the wiring and turn ON again Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be dam...

Page 105: ...AQ71BU FBQ FUQ FVQ Method of Error Detection The error is detected by the limit switch when the motor turns Error Decision Conditions When ON OFF of the micro switch for position detection cannot be r...

Page 106: ...the connector turn OFF the power supply and turn the power ON and check if the limit switch has continuity when the power supply is restarted Turn OFF the power supply and turn the power ON and measu...

Page 107: ...e Models FCQ FBQ FMDQ B7 Method of Error Detection Detect error checking the input voltage of fan motor Error Decision Conditions When the input voltage of fan motor is 150V and below or 386V and abov...

Page 108: ...each wiring Check the condition of the power supply Check if power supply voltage is 220V 240V 10 Check if there is power open phase or defective wiring Check if power supply voltage side unbalance is...

Page 109: ...Q Method of Error Detection Use a micro computer to check the electronic expansion valve for coil conditions Error Decision Conditions When the pin input of the electronic expansion valve is not norma...

Page 110: ...electronic expansion valve coil Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged YES The connecting cable is short circuited or disco...

Page 111: ...il Disconnect the electronic expansion valve from the PCB and check the continuity between the connector pins Normal Continuity No continuity Pin No 1 White 2 Yellow 3 Orange 4 Blue 5 Red 6 Brown 1 Wh...

Page 112: ...he compressor is in non operation Error Decision Conditions The float switch changes from ON to OFF while the compressor is OFF Supposed Causes Error in the drain pipe installation Defective float swi...

Page 113: ...problems can also occur in the optional drain pump Is drain pump installed NO YES Check the jumper connector Is drain pump normal NO YES Check the drain pump and the drain pipe Is amount of circulate...

Page 114: ...ON to OFF while the compressor is in non operation Supposed Causes Humidifier unit optional accessory leaking Defective drain pipe upward slope etc Defective indoor unit PCB Troubleshooting YES NO Fie...

Page 115: ...resistance of the capacity setting adaptor and the memory inside the IC memory on the indoor unit PCB and whether the value is normal or abnormal is determined Error Decision Conditions Operation and...

Page 116: ...setting adaptor to a PCB in which the capacity is memorized the capacity setting for the PCB will become the capacity setting of the adaptor Priority of capacity setting adaptor Is the capacity settin...

Page 117: ...PCB s memory IC A capacity setting adaptor that matches the capacity of the unit is required in the following case In case the indoor unit PCB installed at the factory is for some reason changed at t...

Page 118: ...ndoor unit PCB Install a capacitor setting adaptor that matches the capacity of the indoor unit YES YES Turn OFF the power supply and turn the power ON NO The error was caused by a missing capacity re...

Page 119: ...tor is not connected Supposed Causes Defective capacity setting adaptor connection Defective indoor unit PCB Troubleshooting NO YES The indoor unit PCB was replaced with a spare PCB Replace the indoor...

Page 120: ...whether the value is normal or abnormal is determined Error Decision Conditions The error is generated when the following conditions are fulfilled Supposed Causes Defective capacity setting adaptor c...

Page 121: ...ect capacity for the PCB you have to connect a capacity setting adaptor with the correct capacity setting to the PCB The capacity setting for the PCB will become the capacity setting of the adaptor be...

Page 122: ...od of Error Detection Check the condition of transmission between indoor unit PCB and fan PCB using computer Error Decision Conditions When normal transmission is not conducted for certain duration Su...

Page 123: ...ove field setting mode installation position is 01 NO YES NO The error is displayed again Replace the indoor unit PCB Connect the connecter and turn ON the power again Caution Be sure to turn off the...

Page 124: ...PCB 2 Short circuit X70A 3 After turning ON the power check below numbers under local setting remote control Confirmation Second code No at the condition of first code No 21 on mode No 41 After confir...

Page 125: ...ndition of transmission between indoor unit PCB and adaptor PCB using micro computer Error Decision Conditions When normal transmission is not conducted for certain duration 15 seconds or more After 6...

Page 126: ...on the remote controller Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO Is the connection of connector on adaptor PCB normal Con...

Page 127: ...Si20 701_B Troubleshooting by Remote Controller 120 NO Error is displayed again Normal operation Check the panel PCB and indoor unit PCB YES A...

Page 128: ...FH FDBG FDBT FDMG FCQ H FMCQ FFQ FHQ FAQ FBQ FDQ FMDQ FUQ FVQ FCQG FHQG Method of Error Detection The error is detected by temperature detected by thermistor Error Decision Conditions When the thermi...

Page 129: ...YES Correct the connection Check the thermistor resistance Is it normal NO YES Replace the thermistor Check the contact between thermistor and PCB Check the connector connection Caution Be sure to tu...

Page 130: ...ler Display C6 Applicable Models FBQ FMDQ B7 Method of Error Detection Conduct open line detection with fan PCB using indoor unit PCB Error Decision Conditions When the communication data of fan PCB i...

Page 131: ...1P replaced with a spare PCB Was correct capacity setting adaptor installed when replacing it with a spare PCB Caution Be sure to turn off the power switch before connecting or disconnecting connector...

Page 132: ...ted when the humidity sensor becomes disconnected or shorted when the unit is running Even if the sensor is defective the system can operate Supposed Causes Defective sensor Broken wire External facto...

Page 133: ...QG FMCQ Method of Error Detection Even if an error occurs operation still continues Error is detected according to the moisture output voltage detected by the moisture sensor Error Decision Conditions...

Page 134: ...umidity sensor PCB assy and taking the steps 1 and 2 replace the indoor unit PCB assy Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged...

Page 135: ...od of Error Detection Even if remote controller thermistor is defective system is possible to operate by system thermistor The error is detected by temperature of remote controller thermistor Error De...

Page 136: ...ooting NO The error is displayed again YES Replace the remote controller Turn OFF the power supply and turn the power ON Caution Be sure to turn off the power switch before connecting or disconnecting...

Page 137: ...Detection Actuation of each safety device is detected by safety device input circuit Safety device unified detection Supposed Causes Causes related to PCB Defective outdoor unit PCB Defective safety d...

Page 138: ...an turning correctly Has draft passage been provided Provide the draft passage Replace the fan motor Remove the obstacles so the fan turns correctly or replace the fan Is power being properly supplied...

Page 139: ...ice is detected by safety device input circuit Safety device unified detection Supposed Causes Causes related to safety devices Defective safety device input connection Safety device s harness is brok...

Page 140: ...he fan turning correctly Has draft passage been provided Provide the draft passage Replace the fan motor Remove the obstacles so the fan turns correctly or replace the fan Is power being properly supp...

Page 141: ...outdoor unit fan operate properly Does the air enter the refrigerant system Conduct refrigerant collection and vacuum drying and then add proper amount refrigerant Check and replace the outdoor unit f...

Page 142: ...ice is detected with safety device input circuit Unified detection of actuation of each safety device Possible Causes Defective input connection of safety device Defective harness of safety device Sto...

Page 143: ...ly open Is the compressor defective 2 Replace the compressor Check for insulation in pump down state Open the stop valve Is the refrigerant piping system clogged Replace the clogged parts Is refrigera...

Page 144: ...ty device for errors in the compressor If the compressor errors due to closed stop valve or refrigerant shortage this safety device may be actuated In this case the compressor cannot restart and its t...

Page 145: ...r abnormality is detected when the temperature of outdoor unit fan motor coil rises excessively due to motor seizing or other reason and the thermal switch turns OFF Error Decision Conditions When the...

Page 146: ...it Replace the outdoor unit PCB YES NO Q1L fan protection device activation Defective fan motor defective capacitor etc Does the unit operate normally when remote controller is used YES Momentary powe...

Page 147: ...or not E2PROM is normal Error Decision Conditions When E2PROM error when turning the power supply ON Possible Causes Defective outdoor unit PCB Troubleshooting Turn the power supply OFF and turn the...

Page 148: ...n when the power supply is turned OFF Supposed Causes Defective outdoor unit PCB Troubleshooting Turn OFF the power once and turn ON again Return to normal YES External factor other than error for exa...

Page 149: ...supply ON Supposed Causes Defective outdoor unit PCB Troubleshooting Is normal reset possible YES NO External factor Noise etc Turn OFF the power supply remove the fan motor connector and then turn O...

Page 150: ...ons Case where high pressure switch is actuated when the compressor is operating Supposed Causes Causes related to PCB Defective high pressure switch High pressure switch s harness is broken or discon...

Page 151: ...tly Do the HPS s for control and safety have continuity NO Replace the HPS without continuity Turn OFF the power supply and check the following after letting the compressor rest for 2 or 3 minutes Cau...

Page 152: ...high pressure switch is actuated when the compressor is operating Supposed Causes Causes related to PCB Defective high pressure switch High pressure switch s harness is broken or disconnected Defecti...

Page 153: ...nd check the following after letting the compressor rest for 10 minutes NO Reset remote controller and operate again Check the installation condition Is high pressure during operation abnormally high...

Page 154: ...shooting by Remote Controller Si20 701_B 147 Note 1 Some models are not equipped with an HPS for control or safety Display error H3 code YES Replace the high pressure switch NO Replace the outdoor uni...

Page 155: ...tected when the contact of the high pressure protection switch opens Error Decision Conditions The error is generated when the HPS activation count reaches the number specific to the operation mode Su...

Page 156: ...there continuity in protection HPS NO YES Replace the open circuit HPS Is high pressure abnormally high during operation 1 YES Defective refrigerant system Turn OFF the power Wait 2 to 3 minutes afte...

Page 157: ...t checks continuity in the high pressure switch Error Decision Conditions When the high pressure switch is actuated Supposed Causes Defective high pressure switch Disconnection in high pressure switch...

Page 158: ...protection high pressure switch NO NO YES Replace the high pressure switch with no continuity Turn OFF the power supply Wait for 10 minutes after compressor stops operating then check the following Se...

Page 159: ...P 475 A RZQ C NO Except RZQ C Replace the outdoor unit PCB A1P Is the error H3 displayed YES Replace the high pressure switch YES Correct the failure Check Refrigerant overcharge Replace the outdoor...

Page 160: ...e protection switch opens Error Decision Conditions Error is generated when the HPS activation count reaches the number specific to the operation mode Reference Operating pressure of high pressure swi...

Page 161: ...CB YES Is the high pressure switch operating value normal i e 4 0MPa Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Are the 3 points...

Page 162: ...e high pressure value checked with the Service Checker and the voltage of the pressure sensor 1 3 Make measurement of voltage of the pressure sensor Refer to P 483 A The high pressure sensor is normal...

Page 163: ...ermediate thermistor R5T detects the pressure shown below 3 92 MPa or more continuously for 1 minute Reference equivalent saturation temperature 62 C In heating When the indoor unit intermediate therm...

Page 164: ...ediate heat exchanger thermistor The outdoor unit fan is rotating during operation NO YES Remove the foreign matter Replace the fan motor NO Troubleshooting E9 YES Are the operation of electronic expa...

Page 165: ...intermediate thermistor normal Remove the foreign matter Replace the fan motor NO Replace the indoor unit intermediate heat exchanger thermistor NO Troubleshooting E9 YES Are the operation of electron...

Page 166: ...ssure switch is activated 4 0 MPa When the outdoor unit intermediate thermistor R5T detects the pressure shown below 3 92 MPa or more continuously for 1 minute Reference equivalent saturation temperat...

Page 167: ...uity in the high pressure switch connecting line NO YES Replace the connecting line Is there continuity in the high pressure switch NO Replace the high pressure switch with no continuity NO Open the s...

Page 168: ...igh pressure switch NO Replace the indoor unit intermediate heat exchanger thermistor NO Replace the outdoor unit intermediate heat exchanger thermistor Turn the power ON and restart H3 is displayed I...

Page 169: ...the safety device circuitry Error Decision Conditions Case where low pressure switch is actuated when the compressor is operating Supposed Causes Causes related to PCB Defective low pressure switch Lo...

Page 170: ...upply and check the following after letting the compressor rest for 2 or 3 minutes Check the installation condition Is low pressure during operation abnormally low Does the low pressure sensor for saf...

Page 171: ...indoor unit intermediate thermistor In heating Detect error by the intermediate heat exchanger thermistor Error Decision Conditions In cooling When the detection pressure is the following value 0 12MP...

Page 172: ...ansion valve Troubleshooting Is it in cooling operation Is the stop valve open NO NO In heating YES Open the stop valve Check the installation conditions YES In cooling Caution Be sure to turn off the...

Page 173: ...resistance Is it normal NO Connect the connector properly Replace the group thermistor Replace the pressure sensor NO Replace the indoor unit intermediate thermistor Remove the thermistor from the out...

Page 174: ...by Remote Controller Si20 701_B 167 Refer to P 466 YES NO Is low pressure abnormally low CHECK 5 Replace the outdoor unit PCB Correct the refrigerant system defect Replace the PCB equipped with resin...

Page 175: ...od of Error Detection Abnormality is detected by the pressure value with the low pressure sensor Error Decision Conditions Error is generated when the low pressure drops while the compressor is in ope...

Page 176: ...re value checked with the Service Checker and the actual measurement value by pressure sensor Service Checker 1 Mount a pressure gauge on the low pressure service port 2 Reset the operation using the...

Page 177: ...e of the pressure sensor make measurement of voltage at the connector and then convert it to pressure 2 Make measurement of voltage of the pressure sensor Refer to P 470 Refer to P 485 CHECK 7 5V 4 3...

Page 178: ...or Decision Conditions When the low pressure switch is activated during compressor operating Operating pressure 0 12 MPa continuous 5 minutes Supposed Causes Compressor is not defective Stop valve is...

Page 179: ...e low pressure switch properly connected to the outdoor unit PCB NO YES Connect correctly Turn OFF the power supply Wait for a few minutes after compressor stops operating then check the following Che...

Page 180: ...ensor Error Decision Conditions When the detection pressure is the following value Actuating pressure 0 07MPa Supposed Causes Defective low pressure switch Disconnection of the wire harness of the low...

Page 181: ...t correctly Is the converted pressure based on the measured voltage normal 3 NO YES Replace the low pressure sensor Check the installation conditions Measure the voltage DC between the pins 2 and 3 of...

Page 182: ...oltage characteristic of the sensor Outdoor unit PCB A1P Low pressure sensor Micro computer A D input GND 5V Connector Red Black White 4 3 2 1 Measure voltage here Output voltage V PL detected pressur...

Page 183: ...nverter and compressor and detects the position signal pattern Error Decision Conditions The position signal with 3 times cycle as imposed frequency is detected when compressor motor operates normally...

Page 184: ...gh differential pressure at starting YES NO YES Remedy the cause Check and see whether compressor is short circuited or ground YES Replace the compressor Check the installation conditions Caution Be s...

Page 185: ...the inverter and compressor and the error is detected when any abnormality is observed in the phase current waveform Error Decision Conditions This error will be output when the inverter compressor mo...

Page 186: ...cable and then securely connect the connectors NO Make wire connections without a mistake Check the compressor cable for disconnection and flaws Caution Be sure to turn off the power switch before co...

Page 187: ...stance Check the compressor motor coil for any broken wire A NO Has the compressor started up at high differential pressure not less than 0 5MPa Restart the compressor and then check whether or not th...

Page 188: ...r Detection The input current value is detected with a current sensor Error Decision Conditions When the compressor input current exceeds the specified input current value Refer to Approximate Input c...

Page 189: ...power supply Spare PCB is installed using an adaptor not suitable for the applicable model 1 YES Connect an adaptor suitable for the applicable model Check for the installation conditions Check for t...

Page 190: ...current value R71LUVAL 25 30 A RR71MV1 25 3 A R Y 71LUV1 25 30 A RR71MY1 11 5 A R Y 71LUY1 8 63 A RR100MY1 11 5 A R100LUVAL 29 90 A RR125MY1 15 0 A R Y 100LUV1 29 90 A R Y 100LUY1 11 50 A R125LUTAL 25...

Page 191: ...runs Error Decision Conditions When the fan runs with speed less than a specified one for 15 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconn...

Page 192: ...ES NO Remove the foreign matter CHECK 1 Check the resistance value for the fan motor NO Properly connect the connector NO YES YES Ask repair so that the supply voltage will be within the normal range...

Page 193: ...yed again Is the resistance value of the fan motor normal YES Replace the inverter PCB NO YES Replace the fan motor Does the fuse have continuity NO YES Replace the fuse Properly plug the fan motor co...

Page 194: ...fan runs with speed less than a specified one for 6 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconnected When the error is generated 4 times...

Page 195: ...on of the connector Disconnection of the connectors is found YES NO Plug the connector Check the color of the relay Connection error is found in the relay connector YES NO Correct the connection of th...

Page 196: ...onnector of the fan motor YES Replace the fan inverter PCB YES Replace the corresponding fan motor NO The resistance value between the power supply wire terminal of fan motor and the motor frame metal...

Page 197: ...to check the following LED lamps HAP lamp above the compressor inverter PCB NO Replace the fan motor 2 HAP lamp for the PCB does not blink on the condition that HAP lamp for PCB is blinking The signal...

Page 198: ...ions When the fan runs with speed less than a specified one for 6 seconds or more when the fan motor running conditions are met When connector detecting fan speed is disconnected When error is generat...

Page 199: ...and signal cable connector have been connected to the relay harness Power supply and signal cable connectors of different colors are connected for one and the same motor YES NO Use the connectors of t...

Page 200: ...nd the fan inverter PCB are disconnected The fuse white tubular fuse on the fan inverter PCB has a broken wire has no continuity YES Insert the connectors in the harness YES Replace the fan inverter P...

Page 201: ...l cable NO Has a short circuit been established between the fan motor signal cables Vcc and GND and UVW and GND respectively Resistance of the U V and W phases of the fan motor has got imbalanced or s...

Page 202: ...roller Si20 701_B 195 NO Replace the outdoor unit fan motor The LED HAP on the compressor inverter PCB is blinking but the LED HAP on the fan inverter PCB is not blinking YES Replace the fan inverter...

Page 203: ...n and short circuits are detected Error Decision Conditions The error is determined by the following condition For R Y LU There is no common power supply when the power is ON For RY F R Y G GA KU Coil...

Page 204: ...il connected to outdoor unit PCB NO YES Connect it correctly Turn the power supply OFF once and then restart Caution Be sure to turn off the power switch before connecting or disconnecting connectors...

Page 205: ...Check continuity of electronic expansion valve coil Error Decision Conditions For RZ Y Error is generated under the following condition Coil current Open circuit Normal Short circuit For RZQ C Error...

Page 206: ...ect the connection YES YES NO NO External factor Noise etc Is coil resistance of electronic expansion valve normal NO Replace the electronic expansion valve Replace the outdoor unit PCB Turn OFF the p...

Page 207: ...icable Models CMSQ Method of Error Detection Check disconnection of connector Check continuity of electronic expansion valve coil Error Decision Conditions Error is generated under no common power sup...

Page 208: ...power ON and then restart again Normal when coil check 1 of the electronic expansion valve coil is checked NO YES The connecting cable is short circuited or disconnected Replace the electronic expans...

Page 209: ...y Remote Controller 202 Note 1 Make measurement of resistance between the connector pins and then make sure the resistance falls in the range of 40 to 50 Orange 1 Red 2 Yellow 3 Black 4 5 Gray 6 Measu...

Page 210: ...n Conditions When the following conditions are met for 10 minutes Suction pipe superheated degree 4 C Minimum electronic expansion valve opening degree Connector of electronic expansion valve is missi...

Page 211: ...y Turn OFF the power supply and turn the power ON Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged A Is the coil resistance of the ele...

Page 212: ...discharge pipe intermediate heat exchanger and heat exchanger distributor pipe thermistors mounted properly NO YES Mount properly NO Replace the defective thermistor Are the characteristics of each t...

Page 213: ...ontroller 206 Refer to P 474 The error is displayed again YES NO Replace the outdoor unit PCB External factor Noise etc Restart operation B CHECK 9 Refer to to eliminate the causes of wet operation Ac...

Page 214: ...ditions When the following conditions are met for 10 minutes Suction pipe superheated degree 4 C Minimum electronic expansion valve opening degree Connector of electronic expansion valve is missing wh...

Page 215: ...properly connected to the outdoor unit PCB NO YES YES Connect properly Turn OFF the power supply and turn the power ON Caution Be sure to turn off the power switch before connecting or disconnecting c...

Page 216: ...CHECK 3 CHECK 9 Eliminate the causes of wet operation Actually it is in wet operation A The error is displayed again YES NO Replace the outdoor unit PCB External factor Noise etc Restart operation YES...

Page 217: ...Detection The error is detected according to temperature detected by discharge pipe thermistor Error Decision Conditions When discharge pipe temperature becomes abnormally high When discharge pipe te...

Page 218: ...ipe port YES NO Correctly place the discharge pipe thermistor Is electronic expansion valve fitted NO YES Is electronic expansion valve coil disconnected from valve body NO YES Check refrigerant pipin...

Page 219: ...on Conditions When discharge pipe temperature becomes abnormally high When discharge pipe temperature rises suddenly When the discharge pipe thermistor comes out of its installed position Supposed Cau...

Page 220: ...of phase Is electronic expansion valve fitted NO YES Is electronic expansion valve coil disconnected from valve body NO YES Check refrigerant piping circuit clogging Correctly place the electronic ex...

Page 221: ...ed according to the temperature detected by the discharge pipe thermistor Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temper...

Page 222: ...ive compressor Conduct inspection Is discharge pipe thermistor connected to the correct connector NO YES Correct the connection and operate the unit Is discharge pipe thermistor characteristic normal...

Page 223: ...g to the temperature detected by the discharge pipe temperature sensor Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temperatu...

Page 224: ...he refrigerant system Pull out the discharge pipe thermistor from the outdoor unit PCB and then make measurement of resistance using a multiple meter Caution Be sure to turn off the power switch befor...

Page 225: ...the discharge pipe thermistor Error Decision Conditions When the discharge pipe temperature rises to an abnormally high level When the discharge pipe temperature rises suddenly When the discharge pip...

Page 226: ...correctly connected to PCB NO YES Connect correctly and operate the unit again Is the discharge pipe thermistor attached to the discharge pipe NO YES Attach the thermistor and operate the unit again...

Page 227: ...changer thermistor in cooling operation or indoor unit heat exchanger thermistor in heating operation Error Decision Conditions When the outdoor unit heat exchanging temperature in cooling operation o...

Page 228: ...ditions CHECK 4 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged High pressure is too high YES Correct the high pressure In cooling op...

Page 229: ...ger deicer temperature and liquid pipe temperature during check operation Error Decision Conditions When the amount of refrigerant which is calculated by using the outdoor air temperature heat exchang...

Page 230: ...oor air thermistor heat exchanger deicer thermistor and the liquid pipe thermistor from the outdoor unit PCB and measure resistance with a tester Replace the thermistor Rectify the refrigerant overcha...

Page 231: ...tion Continuity of the high pressure switch is detected by the safety device circuitry Error Decision Conditions When the compressor is OFF and the high pressure switch does not have continuity Suppos...

Page 232: ...O YES Connect correctly Check the following after letting rest for 2 or 3 minutes Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Do...

Page 233: ...hecks for the continuity in the high pressure switch Error Decision Conditions When the high pressure switch has no continuity during the compressor stops operating Possible Causes Defective high pres...

Page 234: ...tes after the unit stops operating then proceed to the subsequent check Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Does the high...

Page 235: ...ive high pressure switch Open circuit in high pressure switch harness Defective connection of high pressure switch connector Defective outdoor unit PCB Troubleshooting Is protection HPS connector conn...

Page 236: ...tection The protection device circuit checks continuity in the high pressure switch Error Decision Conditions When there is no continuity in the high pressure switch during compressor stops operating...

Page 237: ...it stops operating then check the following Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Is there continuity in each protection hi...

Page 238: ...a Error Decision Conditions When there is no continuity in the low pressure sensor during compressor start operating Low pressure sensor is not operated when the low pressure is dropped under specific...

Page 239: ...power supply After 10 minutes check the following Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Is low pressure abnormally low NO...

Page 240: ...Pa Error Decision Conditions When there is no continuity in the LPS during compressor start operating LPS is not operated when the low pressure is dropped under specific pressure 0 12MPa during compre...

Page 241: ...y in control and protection LPS Connect correctly Turn OFF the power supply After 10 minutes check the following Is low pressure abnormally low Caution Be sure to turn off the power switch before conn...

Page 242: ...cable Models CMSQ RZQ C7 Method of Error Detection Detection of abnormal signal from fan motor Error Decision Conditions In case of detection of abnormal signal at starting fan motor Supposed Causes A...

Page 243: ...t correctly NO Replace the fan motor Replace the fan inverter PCB Turn power OFF Check connector of fan motor 1 The resistance of fan motor read wire connector pins between Vcc UVW and GND UVW balance...

Page 244: ...able Models RZQ K H RZQ S B C RZR KU HU Method of Error Detection The error is detected according to the temperature detected by each individual thermistor Error Decision Conditions When thermistor is...

Page 245: ...or J7 Intermediate heat exchanger thermistor J8 Liquid pipe thermistor YES Normal NO YES Connect correctly Check connectors for connection Remove thermistor from outdoor unit PCB then measure the resi...

Page 246: ...t Supposed Causes Defective outdoor air thermistor Defective outdoor air thermistor connector connection Defective outdoor unit PCB Troubleshooting Is the thermistor normal NO YES Replace the outdoor...

Page 247: ...ed Causes Defective outdoor air thermistor Defective connection of outdoor air thermistor connector Defective outdoor unit PCB Troubleshooting YES Is connector connected to the outdoor unit PCB NO YES...

Page 248: ...HU Method of Error Detection The error is detected by the pressure measured with pressure sensor Error Decision Conditions When the detect pressure becomes following Detected pressure 0 05MPa continue...

Page 249: ...re sensor is correctly connected to the outdoor unit PCB Measure the voltage between the pins 1 and 3 of the above connector CHECK 7 Caution Be sure to turn off the power switch before connecting or d...

Page 250: ...h the current detected with the current sensor Error Decision Conditions While in operation When the current detected with the current sensor is not more than a constant value 1 5A While in stopping W...

Page 251: ...a remote controller Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged The error is displayed again NO External factor Noise etc Replac...

Page 252: ...pposed Causes Defective discharge pipe thermistor Defective discharge pipe thermistor s connector connection Defective outdoor unit PCB Troubleshooting Caution Be sure to turn off the power switch bef...

Page 253: ...ection The error is detected whether the resistance of thermistor is abnormal or normal Error Decision Conditions When a short circuit or an open circuit in the discharge pipe thermistor is detected S...

Page 254: ...or unit PCB NO YES Connect thermistor and restart operation Resistance measured after remove thermistor from outdoor unit PCB is normal NO Replace the thermistor Replace the outdoor unit PCB Caution B...

Page 255: ...Q Method of Error Detection The error is detected from the temperature detected by the suction pipe thermistor Error Decision Conditions When a short circuit or an open circuit in the suction pipe the...

Page 256: ...O YES YES Connect the connector and turn ON again Resistance is normal when measured after disconnecting the thermistor from the outdoor unit PCB Caution Be sure to turn off the power switch before co...

Page 257: ...auses Defective heat exchanger thermistor Defective heat exchanger thermistor s connector connection Defective outdoor unit PCB Troubleshooting Caution Be sure to turn off the power switch before conn...

Page 258: ...Supposed Causes Defective heat exchanger thermistor Incomplete connection of heat exchanger thermistor Defective outdoor unit PCB Troubleshooting Refer to P 460 YES Connector is connected to the outd...

Page 259: ...e Models CMSQ Method of Error Detection The error is detected according to the temperature detected by liquid pipe thermistor Error Decision Conditions When the liquid pipe thermistor is short circuit...

Page 260: ...e outdoor unit PCB NO YES Connect the connector and operate the unit again Is the resistance measured after removing the thermistor from outdoor unit PCB normal NO Replace the thermistor Replace the o...

Page 261: ...els CMSQ Method of Error Detection The error is detected according to the temperature detected by subcooling heat exchanger gas pipe thermistor Error Decision Conditions When the subcooling heat excha...

Page 262: ...ected to the outdoor unit PCB NO YES Connect the connector and operate the unit again Is the resistance measured after removing the thermistor from outdoor unit PCB normal NO Replace the thermistor Re...

Page 263: ...dels RZQ CMSQ Method of Error Detection The error is detected from the pressure detected by the high pressure sensor Error Decision Conditions When the high pressure sensor is short circuit or open ci...

Page 264: ...Connect the high pressure sensor and turn ON again Measure the voltage VH between the pins 1 and 3 of the above connector 1 Caution Be sure to turn off the power switch before connecting or disconnect...

Page 265: ...ontroller 258 2 Pressure Sensor pressure voltage characteristics table Detected pressure PH MPa Output voltage V 0 5 0 5 0 0 5 1 0 2 0 3 0 1 5 2 5 0 5 1 5 2 5 3 5 0 1 2 3 4 VDC PH PH 1 38V 0 69 PH Det...

Page 266: ...RZQ S B RZQ C7 CMSQ Method of Error Detection The error is detected from pressure detected by low pressure sensor Error Decision Conditions When the suction pipe pressure sensor is short circuit or op...

Page 267: ...ween the 1 VH and low pressure is normal 2 when voltage is measured between pins 2 and 3 of outdoor unit PCB 1 Connect low pressure sensor properly and restart system Caution Be sure to turn off the p...

Page 268: ...synchronized operation at the time of startup Detect error using an MP PAM series capacitor overvoltage sensor Error Decision Conditions When overcurrent is detected at the time of waveform output bef...

Page 269: ...tor Power ON again Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Is the lead wire for compressor connected to PCB and compressor wi...

Page 270: ...ng waveform output before compressor startup Detect the error by current sensor value during synchronized operation at the time of startup Error Decision Conditions In case of overcurrent during wavef...

Page 271: ...er PCB for the compressor at the same time Replace the inverter PCB YES Check if the insulation resistance of the compressor is more than 100k Turn OFF the power supply once and then turn it ON again...

Page 272: ...using an MP PAM series capacitor overvoltage sensor Error Decision Conditions When over current is detected at the time of waveform output during operating the compressor When the current sensor error...

Page 273: ...value of the fan motor normal NO YES Replace the fan motor Turn OFF the power supply and remove the connector for fan motor and then operate again Check the resistance value for the fan motor Does the...

Page 274: ...Troubleshooting by Remote Controller Si20 701_B 267 Refer to P 459 Error is displayed again YES Replace the outdoor unit PCB Turn the power ON again A NO External factor Noise etc CHECK 1...

Page 275: ...d by the thermistor of the radiation fin Error Decision Conditions When the temperature of the inverter radiation fin increases abnormally due to defective heat dissipation Supposed Causes Activation...

Page 276: ...problem be caused by high radiation fin temperature 1 YES Correct the problem Do LEDs on outdoor unit PCB indicate radiation fin temperature abnormality NO Inspect outdoor unit PCB and remote control...

Page 277: ...ror Decision Conditions When the temperature of the inverter radiation fin rises abnormally due to defective heat dissipation Supposed Causes Defective radiation fin thermistor High outdoor air temper...

Page 278: ...supply and then press the remote controller check button once Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Is the connector of th...

Page 279: ...1B 87 C 77 C RZQG71LV1B 85 C 75 C RZR100 140KUV1 RZR100 140HUY1 RZR KUV2S RZR HUY2S RZQ100 140C7V1B RZQS125 140C7V1B 88 C 78 C RZQG100 140LV1B 89 C 79 C Is the error displayed again when the unit star...

Page 280: ...hod of Error Detection Fin temperature is detected by the thermistor of the radiation fin Error Decision Conditions When the temperature of the inverter radiation fin increases above 93 C Supposed Cau...

Page 281: ...r stains Airflow for interference Fan propeller for damage Whether or not outdoor air temperature is too high Defective radiation fin from the switch box Conduct the checks shown below Radiation fin f...

Page 282: ...Troubleshooting by Remote Controller Si20 701_B 275 Refer to on P 460 X111A EH CONNECTOR WHITE CHECK 3...

Page 283: ...ting The temperature of the radiation fin increased up to 93 C YES NO YES Defective radiation of the power unit The air intake is closed Dirt of the radiation fin The outdoor air temperature is high T...

Page 284: ...ES Replace the inverter PCB Continue operation There is a possibility of high temperature of the radiation fin caused by any field factors Check the following items Dirt of the radiation fin The flow...

Page 285: ...transistor is converted to voltage by T1C DC current sensor for detection Error Decision Conditions When an excessive current flows in the power transistor Instantaneous overcurrent also causes activ...

Page 286: ...erable using remote controller The error is displayed again Inspect indoor unit PCB and remote controller Inspect compressor for short circuit and ground fault Disconnect compressor inverter Disconnec...

Page 287: ...eating reset by remote controller may not be possible YES NG OK NO Is inverter output voltage same in all 3 phases Check main circuit parts Inspect compressor Correct the wiring Defective main circuit...

Page 288: ...of Error Detection The error is detected by converting the current flowing in the power transistor Error Decision Conditions When an excessive current flows in the power transistor 32 3A Supposed Caus...

Page 289: ...lve open YES YES YES NO NO NO CHECK 6 Is continuity of the power transistor normal YES YES The compressor coil is shorted or broken A Replace the inverter compressor Replace the inverter compressor Co...

Page 290: ...t the compressor and then check whether or not the error recurs NO Restart the compressor and then check whether or not the error recurs Continues operation There may have been momentary power failure...

Page 291: ...he current flowing to power transistor into voltage with CT1 DC current sensor Error Decision Conditions When overcurrent has run to power transistor Actuated even by instantaneous overcurrent Suppose...

Page 292: ...tor IGBT Is the continuity normal Error is displayed again NO NO YES YES YES Replace the outdoor unit PCB Go to the other troubleshooting NO Normal operation NO Continue the operation normally CHECK 4...

Page 293: ...Remote Controller 286 NO Is instantaneous voltage drop generated YES Correct the power supply Compressor inspection Inspect according to the diagnosis procedure for abnormal noise vibration operating...

Page 294: ...lso causes activation Supposed Causes Defective compressor coil disconnected defective insulation Compressor startup error mechanical lock Defective inverter PCB Troubleshooting Compressor inspection...

Page 295: ...or motor coil for any broken wire Make wire connections according to the Wiring Diagram Check the power transistor on the inverter PCB using a multiple tester CHECK 16 YES The power transistor has an...

Page 296: ...or not the error recurs NO B Normal Onsite causes such as instantaneous power failure or open phase Conduct checks and diagnosis of the compressor Restart the compressor and then check whether or not...

Page 297: ...owing to power transistor into voltage with CT1 DC current sensor Error Decision Conditions When overcurrent has run to power transistor Actuated even by instantaneous overcurrent Supposed Causes Defe...

Page 298: ...valve YES Replace the compressor Check the installation conditions Turn OFF the power supply and then disconnect the connection between the compressor and inverter CHECK 4 Caution Be sure to turn off...

Page 299: ...ct the power supply Compressor inspection Inspect according to the diagnosis procedure for abnormal noise vibration operating status etc of the compressor A NO YES Is the inverter output voltage gener...

Page 300: ...he compressor stops due to error after elapsed time of 5 seconds Therefore check the voltage increase for 5 seconds Model Instantaneous overcurrent detection value RZQ71K RZR71K RZQ71B9V3B RZQS71 100B...

Page 301: ...verted to voltage by T1C DC current sensor for detection Error Decision Conditions When overload in the compressor is detected exception at startup In RZ Y error is not generated by the electronic the...

Page 302: ...ressor and refrigerant system Is inverter output voltage same in all 3 phases Check main circuit parts YES Inspect compressor NG Correct the wiring Defective main circuit parts Defective inverter Disc...

Page 303: ...Si20 701_B Troubleshooting by Remote Controller 296 Note 2 Detecting values vary according to operating frequency Detecting value decrease 10 for each HPS activation...

Page 304: ...icable Models CMSQ Method of Error Detection The error is detected by current flowing in the power transistor Error Decision Conditions When overload in the compressor is detected Inverter secondary c...

Page 305: ...according to the Wiring Diagram Is the stop valve open The insulation resistance is low i e not more than 100k Overcurrent Check the compressor and refrigerant system in the same manner as that for E...

Page 306: ...again Replace the inverter PCB The inverter is likely to have got defective due to the error of the compressor After the completion of replacement be sure to check the compressor End of measures Chec...

Page 307: ...Decision Conditions When overload in the compressor is detected For 460V units 1 19 0A and over continues for 5 seconds 2 16 1A and over continues for 260 seconds For 230V units 1 A current of 33 5A...

Page 308: ...e normal NO YES Correct the wiring and connection Insulation resistance of the compressor is 100 k or below YES NO Replace the inverter compressor Compressor coils are disconnected YES NO Replace the...

Page 309: ...NO Error code L8 is displayed again Continue the operation NO Check if the pressure difference between high pressure and low pressure before restarting is 0 2MPa or below Defective pressure equalizing...

Page 310: ...The error is detected from the current flowing to power transistor into voltage with CT1 DC current sensor Error Decision Conditions When compressor overload except for when startup is detected Suppos...

Page 311: ...essive refrigerant charging NO Open the stop valve YES Turn OFF the power supply High pressure is high Is the stop valve opened Replace the outdoor unit PCB Replace the outdoor unit PCB Compressor ins...

Page 312: ...ndary electronic thermal detection value Refer to P 464 Refer to P 468 Refer to P 475 Model Detection value RZQG71 Cooling 12 6 or 12 2A 260 seconds Heating 14 8A 260 seconds RZQG100 140 Cooling 16 1A...

Page 313: ...rrent flowing to power transistor into voltage with CT1 DC current sensor Inverter PCB detects the disorder of position signal Error Decision Conditions When compressor overload except for when startu...

Page 314: ...S71 100C7V1B Cooling 13 8A 260 seconds Heating 14 8A 260 seconds RZQ100 140C7V1B RZQS125 140C7V1B Cooling 31A 5 seconds or 21 1A 260 seconds Heating Is the secondary current of the inverter higher tha...

Page 315: ...fer to P 464 YES YES CHECK 4 Continuity check in the power transistor IGBT Is the continuity normal NO Compressor inspection Inspect according to the diagnosis procedure for abnormal noises vibration...

Page 316: ...ethod of Error Detection Current flowing in the power transistor is converted to voltage by T1C DC current sensor for detection Error Decision Conditions When overload in the compressor is detected du...

Page 317: ...ualization Inspect refrigerant system Is inverter output voltage same in all 3 phases Check main circuit parts YES Inspect compressor NG Correct the wiring Defective main circuit parts Defective inver...

Page 318: ...r code will be output if overcurrent occurs at the time of startup Error Decision Conditions When the startup control is failed When an overcurrent is passed to the inverter due to the error of a comp...

Page 319: ...e the compressor Replace the inverter PCB The inverter is likely to have got defective due to the error of the compressor After the completion of replacement be sure to check the compressor NO NO YES...

Page 320: ...YES NO YES A End of measures Check the refrigerant system Check of compressor Check the compressor for abnormal sounds vibration operating conditions and others according to the Compressor Diagnosis...

Page 321: ...e current flowing to power transistor into voltage with CT1 DC current sensor Inverter PCB detects the disorder of position signal Error Decision Conditions When compressor overload and change of load...

Page 322: ...Insufficient pressure equalization Check refrigerant system NO Replace the outdoor unit PCB Check the installation conditions Turn OFF the power supply and then disconnect the connection between the...

Page 323: ...place the compressor Is the inverter output voltage generated approximately at the same increasing speed on each phase after turning ON again 1 U V V W W U NO Replace the outdoor unit PCB NO Compresso...

Page 324: ...ter PCB and control PCB by micro computer Error Decision Conditions When the correct communication is not conducted in certain period Supposed Causes Connection error between the inverter PCB and outd...

Page 325: ...se Correct the wiring NO Mount the correct type of fan inverter NO NO Mount the correct type of compressor inverter The insulation resistance is low i e not more than 100k Is the PCB address of the co...

Page 326: ...ors shown below Example CMSQ A7 Fan 1 A1P X28A X6A A3P A1P X20A X4A A3P A3P X61A X402A A2P A3P X1A X403A A2P A3P X5A X5A A4P A3P X41A X3A A4P A4P X4A Short connector Replace the noise filter of the A2...

Page 327: ...ot LC Recheck for the error code Check 10 or more seconds after the power supply is turned ON Replace the fan driver PCB Replace the control PCB End of measures The error may temporarily result from o...

Page 328: ...k whether transmission between control and inverter PCB is carried out normally Error Decision Conditions When the transmission is not carried out in a specified period of time or longer Supposed Caus...

Page 329: ...nnector Replace the outdoor unit PCB Disconnect the fan motor connector and turn ON again E7 is displayed LC is not displayed YES Replace the fan motor Inverter transmission defective due to the error...

Page 330: ...transmission between control PCB and inverter PCB is carried out normally Error Decision Conditions When the transmission is not carried out in a specified period of time or longer Supposed Causes Inc...

Page 331: ...and turn ON again Is the transmission wiring between the control PCB and inverter PCB disconnected YES NO Fix the disconnection and turn ON again Is E7 displayed on the remote controller Is LC not di...

Page 332: ...een on inverter PCB blinking NO YES Replace the outdoor unit PCB Is the micro computer normal LED on control PCB blinking NO Replace the outdoor unit PCB YES RZQ K RZQ H RZQ S B C RZR Check for defect...

Page 333: ...ly the increased ripple is detected Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status Error is not decided while the unit o...

Page 334: ...alize the field cause Fix the power supply voltage imbalance Part or wiring defect After turning the power supply OFF check and repair the main circuit wiring or parts 1 Loose or disconnected wiring b...

Page 335: ...accompanying spare parts Be sure to explain to the user that there is a power supply imbalance for which DAIKIN is not responsible Using a device capable of constant recording of power supply voltage...

Page 336: ...according to the voltage waveform of main circuit capacitor built in inverter Error Decision Conditions When the aforementioned voltage waveform becomes identical with the waveform of the power suppl...

Page 337: ...he outdoor unit PCB Open phase NO External factor Open phase of power supply voltage YES NO YES Field factors Is the voltage imbalance between phases large 1 NO YES Field factors Replace the outdoor i...

Page 338: ...Models RZ Y Method of Error Detection Open circuit or short circuit in radiation fin thermistor is detected when the compressor is not operating Error Decision Conditions When open circuit or short ci...

Page 339: ...nverter Reset Disconnect connector from the outdoor unit PCB and check resistance of temperature thermistor at normal temperature Is radiation fin thermistor defective NO YES External factor Check LED...

Page 340: ...detected when the compressor is not operating Error Decision Conditions When the resistance value of thermistor becomes a value equivalent to open or short circuited status Error is not decided while...

Page 341: ...ion resistance is low i e not more than 100k YES The insulation resistance is low i e not more than 1M Replace the compressor Replace the fan motor Replace the fan driver PCB YES NO NO Power OFF Remov...

Page 342: ...circuit of the radiation fin thermistor is detected during the compressor stops operating Supposed Causes Defective radiation fin thermistor Defective outdoor unit PCB Troubleshooting Refer to P 459...

Page 343: ...capacity setting adaptor X26A is the same as that of outdoor unit capacity Error Decision Conditions When the set value with the E2PROM differs from that of the outdoor unit capacity or any capacity...

Page 344: ...required only when the PCB is replaced with a spare PCB Is the capacity setting adaptor connected to the outdoor unit PCB 1 NO YES Connect an adaptor suitable for the applicable model Check whether t...

Page 345: ...n the power switch is turned ON Supposed Causes Inappropriate capacity setting adaptor Defective outdoor unit PCB Troubleshooting Is capacity setting adaptor connected to outdoor unit PCB NO YES Conne...

Page 346: ...hod of Error Detection The defective or no field setting after replacing PCB or defective PCB combination is detected through communications with the inverter Error Decision Conditions Whether or not...

Page 347: ...YES YES When replacing the main PCB were field setting properly made NO Correct the field settings Is the type of PCB correct NO Replace with a correct PCB Reset and then restart YES Caution Be sure t...

Page 348: ...Driver Remote Controller Display PJ Applicable Models RZQ C7 Method of Error Detection To be detected based on the data transmission with INV Error Decision Conditions Judge if the inverter PCB type i...

Page 349: ...nverter PCB Replace with the correct compressor inverter PCB Was the dip switch correctly set up when replacing the main PCB NO Correctly set up the DIP switch YES Is the lamp in preparation H2P on th...

Page 350: ...set value of capacity setting adaptor for spare is the same as outdoor unit capacity Error Decision Conditions When the set value on E2PROM differs from the outdoor unit capacity or a capacity setting...

Page 351: ...the PCB was replaced with a spare PCB Has the PCB been replaced NO Is the type of PCB correct Replace with a correct PCB Is the correct capacity setting adaptor connected to the outdoor unit PCB NO NO...

Page 352: ...of capacity setting adaptor for replacement is the same as outdoor unit capacity Error Decision Conditions When the set value on E2PROM differs from the outdoor unit capacity or a capacity setting ad...

Page 353: ...only when the PCB was replaced with a spare PCB Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Is the capacity setting adaptor conne...

Page 354: ...es whether there is a refrigerant shortage and detects error Stop due to error does not occur even though an error is determined to have occurred Supposed Causes Refrigerant shortage Refrigerant pipin...

Page 355: ...error and repeats retry Press the check button to indication U0 Supposed Causes Refrigerant shortage Clogged refrigerant piping system 1 Troubleshooting Note 1 Check point 1 Refrigerant filter cloggi...

Page 356: ...r Detection Refrigerant shortage is detected by discharge pipe thermistor Error Decision Conditions Micro computer judge and detect if the system is short of refrigerant The error is not decided while...

Page 357: ...valve or refrigerant system is clogged Requires check of refrigerant system The voltage of X31A pins 2 and 3 on outdoor unit main PCB A1P is 0 8 VDC or less Low pressure sensor output voltage NO Repl...

Page 358: ...701_B 351 Refer to P 460 NO Resistance is normal when measured with the suction pipe thermistor R7T and coil thermistor R4T disconnected from the outdoor unit PCB Replace the thermistor Replace the o...

Page 359: ...or Decision Conditions In cooling operation When the electronic expansion valve opens fully and low pressure is below 0 1 MPa For RZQ C RZQG 0 25MPa continuously for 30 minutes In heating operation Wh...

Page 360: ...lve Is the refrigerant amount appropriate NO Collect refrigerant After vacuum drying is complete charge an appropriate amount of refrigerant YES Check the refrigerant piping system for clogging CHECK...

Page 361: ...ning degree during the control of suction air superheating high pressure indoor heat exchanger temperature and indoor suction air temperature Error Decision Conditions In cooling operation When compre...

Page 362: ...ct refrigerant and recharge a proper amount of refrigerant after vacuum drying Check for refrigerant shortage Check the transmission wiring and piping between the indoor and outdoor units CHECK 12 CHE...

Page 363: ...air temperature electronic expansion valve opening degree compressor frequency and low pressure Error Decision Conditions In cooling operation When compressor frequency does not increase even though...

Page 364: ...vacuum drying Check the transmission wiring and piping between the indoor and outdoor units Is wiring and piping connection matched NO Match wiring and piping connection CHECK 12 Check for inadequate...

Page 365: ...nes whether it is normal phase reverse phase or lack of phase Supposed Causes Defective power supply wiring connection Power supply wiring is broken or disconnected Defective outdoor unit PCB Troubles...

Page 366: ...supply wiring Disconnection in power supply wiring Troubleshooting Error is displayed again NO YES External factor Noise etc Are the phases of circuit breaker matched YES NO Does imbalance in the powe...

Page 367: ...pply reverse phase Power supply open phase Defective outdoor unit PCB A1P Troubleshooting There is an open phase at the power supply terminal section X1M of the outdoor unit YES NO NO Fix the open pha...

Page 368: ...r and the supply voltage Error Decision Conditions When the voltage in main circuit capacitor for inverter and the supply voltage drop 171 190 VAC or when power outage of more than 20 or 30 ms occurs...

Page 369: ...LTAL NO YES Local power supply condition YES Monitor voltage instantaneous voltage drop NO YES Replace the K1M 1 Replace the outdoor unit PCB Replace the outdoor unit PCB Does K1M turn ON YES Is K1M c...

Page 370: ...r and power supply voltage Error Decision Conditions When the voltage of main circuit capacitor built in the inverter and power supply voltage drop 150 170 VAC or when the power failure of several ten...

Page 371: ...NO YES Field factors When the compressor is running measure the voltage between and of electrolytic capacitor C C NO Correct the wiring Is the wiring correct YES Monitor the voltage Instantaneous volt...

Page 372: ...inverter and power supply voltage Error Decision Conditions When the voltage aforementioned is not less than 780V or not more than 320V or when the current limiting voltage does not reach 200V or more...

Page 373: ...On site causes Make proper wire connections without open phase erroneous connections or erroneous order of phases On site causes Correct the unbalanced loads to eliminate the unbalanced state Unbalanc...

Page 374: ...efective NO YES Replace the inverter PCB Observe the conditions of the PCB In the case of a serious failure a compressor failure may cause the failure of the PCB Even if the PCB is replaced it may cau...

Page 375: ...compressor Replace the fan driver PCB If the PCB replaced is badly damaged the fan motor is likely to get defective To make sure recheck the compressor Has the inverter PCB caused damage Has the fan...

Page 376: ...with the power supply replace the inverter PCB If the PCB replaced is badly damaged compressor is likely to get defective To make sure recheck the compressor Check the harness and then replace it if n...

Page 377: ...circuit capacitor built in the inverter and power supply voltage Error Decision Conditions When the voltage of main circuit capacitor built in the inverter and power supply voltage drop or when the p...

Page 378: ...0 VAC YES YES NO NO NO NO Is the fan motor normal Refer to troubleshooting E7 Replace the fan motor NO NO YES YES YES Field factors Replace the fan motor Correct the wiring Remove the connector for fa...

Page 379: ...e Controller 372 NO YES Monitor the voltage Instantaneous voltage drop Replace the outdoor unit PCB Is the measured voltage 220 VDC or more A When the compressor is running measure the voltage between...

Page 380: ...Executed Remote Controller Display U3 Applicable Models CMSQ Method of Error Detection Check operation is executed or not executed Error Decision Conditions The error is decided when the unit starts...

Page 381: ...n ON the local setting mode 2 3 to conduct a check operation Performs the check operation again and completes the check operation When a leakage detection function is needed normal operation of chargi...

Page 382: ...odels R Y FU Method of Error Detection Micro computer checks if transmission between indoor and outdoor units is normal Error Decision Conditions When transmission is not carried out normally for a ce...

Page 383: ...unit transmission error H2P Is H2P blinking NO Replace the indoor unit PCB Replace the indoor unit PCB or correct power supply system Check of indoor unit micro computer normal H1P Is H1P blinking Is...

Page 384: ...Check of outdoor unit micro computer normal H1P Is H1P blinking Is H1P blinking Is H1P blinking Is H1P ON YES NO NO YES Replace the indoor unit PCB Turn OFF the power supply and turn the power ON Turn...

Page 385: ...nditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor outdoor transmission wire is incorrect Defective indoor unit PCB Defective outdoor uni...

Page 386: ...king Check of indoor unit transmission error HBP Is HBP blinking Is H2P ON Does outdoor unit micro computer normal H1P blink Is indoor outdoor transmission wire wired correctly Is H1P blinking YES NO...

Page 387: ...O NO YES Failure of outdoor unit PCB Turn OFF the power supply and turn the power ON Turn OFF the power supply disconnect the No 2 indoor outdoor transmission wire and turn power supply restart NO OFF...

Page 388: ...of Error Detection Micro computer checks if transmission between indoor and outdoor units is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of tim...

Page 389: ...OFF NO Replace the indoor unit PCB Defective indoor unit PCB or error of power supply system Is H2P ON Does outdoor unit micro computer normal H1P blink Is transmission wire between indoor and outdoo...

Page 390: ...inking Is H1P blinking Is H1P blinking Is H1P ON YES NO NO YES Replace the indoor unit PCB Turn OFF the power supply and turn the power ON Turn OFF the power supply disconnect the No 2 indoor outdoor...

Page 391: ...ive fan motor External factor Noise etc Troubleshooting Diagnosis of incorrect or broken disconnected wiring If the LEDs on the indoor unit PCB are OFF it indicates that the transmission wiring betwee...

Page 392: ...essories NO Is HAP on the outdoor unit PCB blinking Outdoor unit PCB Is any optional accessory 1 connected NO YES Wire correctly YES B C YES NO Is the power for the optional accessory supplied from th...

Page 393: ...the fuse have continuity NO Replace the outdoor unit inverter PCB NO Replace the outdoor unit fan motor Check the resistance value of the outdoor unit fan motor After turning OFF the power supply corr...

Page 394: ...rror U4 or UF reoccur YES Replace the outdoor unit inverter PCB YES Replace the indoor unit PCB External factor Noise etc B D The error is displayed again After turning OFF the power supply correctly...

Page 395: ...between indoor and outdoor units is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Indoor to outdoor outdoor to outdoor tr...

Page 396: ...the master outdoor unit PCB for 5 seconds The unit will not operate for up to 12 minutes Supply 220 240V Reset the power supply YES The voltage between terminals L1 and N of the outdoor unit PCB is 22...

Page 397: ...S NO Press and hold the RESET button on the outdoor unit PCB for 5 seconds NO Fix the indoor outdoor or outdoor outdoor unit transmission wiring Operation ready lamp H2P is blinking Disconnect the out...

Page 398: ...error is generated when the micro processor detects that the transmission between the indoor and the outdoor unit is not normal over a certain amount of time Supposed Causes Wiring indoor outdoor tra...

Page 399: ...ecurely connected without wire breaking Is the power supply voltage between 180 and 220 VAC NO YES Field factor NO Connect correctly Repair wire breaking YES YES Is there wrong wiring a wrong wire typ...

Page 400: ...Wire correctly YES Replace the outdoor unit fan motor NO Replace the outdoor unit fan motor YES Is any optional accessory 1 connected NO NO YES YES Turn OFF the power supply and disconnect the connec...

Page 401: ...Q100 140B8W1B F1U Refer to P 482 YES Replace the fuse YES YES NO NO RZQ71B9 RZQS71 100B 7 1 RZQ100 140B 8 3 Replace the inverter PCB A2P RZQ100 140C7 RZQS125 140 C7 1 Replace the outdoor unit PCB A2P...

Page 402: ...PCB A1P RZQ100 140C7 RZQS125 140 C7 1 Replace the outdoor unit PCB A1P YES Replace the indoor unit PCB There is no problem with the unit An external factor noise etc other than unit failure may be th...

Page 403: ...transmission between indoor and outdoor units is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Wiring indoor outdoor trans...

Page 404: ...d Are the connections of wiring connecting indoor and outdoor units proper NO YES YES Wire properly Correct defective wiring and wrong wire type Error is displayed again NO The indoor unit PCB is norm...

Page 405: ...wer supply system error or defective outdoor unit PCB NO NO Lamp is ON or OFF Is HAP blinking Outdoor unit PCB The outdoor unit PCB is normal YES Is HAP lamp ON Outdoor unit PCB Replace the outdoor un...

Page 406: ...Troubleshooting by Remote Controller Si20 701_B 399 B U4 is displayed continuously NO YES Replace the indoor unit PCB It is normal Check for external factors noise etc...

Page 407: ...nd the outdoor unit is not normal over a certain amount of time Error Decision Conditions When the transmission is not carried out normally over a certain amount of time Supposed Causes Wiring indoor...

Page 408: ...180 and 220 VAC YES Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged NO YES Connect the connecting line of indoor and outdoor unit co...

Page 409: ...tor for wiring auto grill and other accessories NO NO YES YES NO NO Wire correctly YES Replace the outdoor unit fan motor YES Is any optional accessory 2 connected Is HAP on the outdoor unit PCB blink...

Page 410: ...ere is no problem with the unit An external factor noise etc other than unit failure may be the cause Does the fuse F6U have continuity Error is displayed again U4 or UF is displayed C After turning O...

Page 411: ...PU RR M Method of Error Detection Micro computer checks if transmission between indoor unit and remote controller is normal Error Decision Conditions When transmission is not carried out normally for...

Page 412: ...to Main Set one of the remote controllers to Sub turn OFF the power supply temporarily then restart operation Change to double core independent cable Replace the remote controller PCB or indoor unit...

Page 413: ...checks if transmission between indoor unit and remote controller is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Defecti...

Page 414: ...emote controllers to Sub turn OFF the power supply temporarily then restart operation Change to double core independent cable Error could be produced by noise Check the surrounding area and restart op...

Page 415: ...r unit and remote controller is normal Error Decision Conditions The error is generated when the micro processor detects that the transmission between the indoor unit and the remote controller is not...

Page 416: ...ne of the remote controllers to SUB turn OFF the power supply temporarily then restart operation Change to double core independent cable External factor Noise etc NO Defective remote controller PCB or...

Page 417: ...o computer detects that the transmission between the indoor and the outdoor unit is not normal over a certain amount of time Error Decision Conditions Normal transmission does not continue for specifi...

Page 418: ...restart YES YES NO NO NO NO Operation returns to normal when the power is turned OFF momentarily Replace the indoor unit PCB NO YES There is possibility of error caused by noise Check the surrounding...

Page 419: ...hen transmission is not carried out normally for a certain amount of time Supposed Causes Improper connection of transmission wiring between outdoor unit and external control adaptor for outdoor unit...

Page 420: ...blem NO C H SELECT is set to MASTER NO NO YES Replace the outdoor unit PCB A1P NO Set C H SELECT to IND YES The cool heat unified address for outdoor units in outdoor outdoor unit transmission is dupl...

Page 421: ...energized Does the cool heat unified address match Outdoor unit unified master unit Is this energized Does the cool heat unified address match Does an error occur when the cool heat selector is set to...

Page 422: ...ction In case of controlling with 2 remote controller check the system using micro computer if signal transmission between indoor unit and remote controller main and sub is normal Error Decision Condi...

Page 423: ...n the SS 1 switch of one remote controller to Main Turn OFF the power supply and restart operation NO Turn OFF the power once and restart operation Replace the remote controller PCB if any error is ge...

Page 424: ...r check the system using micro computer if signal transmission between indoor unit and remote controller main and sub is normal Error Decision Conditions Normal transmission does not continue for spec...

Page 425: ...n the SS 1 switch of one remote controller to Main Turn OFF the power supply and restart operation NO Turn OFF the power once and restart operation Replace the remote controller PCB if any error is ge...

Page 426: ...oor unit and remote controller main and sub is normal Error Decision Conditions The error is generated when in case of controlling with 2 remote controllers the micro processor detects that the transm...

Page 427: ...er wiring Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged Replace the remote controller wiring Turn the SS 1 switch of one remote con...

Page 428: ...r signal of any other indoor unit within the system concerned Error Decision Conditions When the error decision is made on any other indoor unit within the system concerned Supposed Causes Defective t...

Page 429: ...ged Make judgement again based on the indication after 2 minutes and over have passed YES The UA code blinks in the remote controller of the other unit in the same refrigerant circuit Go on to the UA...

Page 430: ...ooting by Remote Controller Si20 701_B 423 NO Go on to the U4 troubleshooting Go on to the U5 troubleshooting YES The U4 code blinks in the remote controller of the other unit in the same refrigerant...

Page 431: ...ive Field Setting Switch Remote Controller Display UA Applicable Models RY F R Y G GA KU LU Supposed Causes Defective indoor unit or outdoor unit PCB Defective power supply PCB Indoor outdoor indoor i...

Page 432: ...orrectly Set correctly NO Are the micro computer normal monitors HAP of all indoor unit PCB blinking Connect correctly Is the indoor indoor and indoor outdoor jumper correctly connected NO YES YES Con...

Page 433: ...ssion normal monitors HBP of all indoor unit PCB blinking Operating normally NO YES NO Connect correctly Replace the indoor unit PCB Is the indoor indoor and indoor outdoor jumper correctly connected...

Page 434: ...data by the type of refrigerant between indoor and outdoor units The number of indoor units is out of the allowable range Error Decision Conditions The error decision is made as soon as either of the...

Page 435: ...ed to the same refrigerant system is within connectable number of unit 1 Normal It is assumed that the code is displayed due to temporary external cause e g noises The number of indoor units that can...

Page 436: ...PCB NO NO Change to a correct combination Replace the outdoor unit main PCB Correct the combination of indoor units with UA displayed Replace the indoor unit PCB A B Is the type of refrigerant for th...

Page 437: ...Models RZQ K H RZQ S B C RZR KU HU Error Decision Conditions The error is generated when incorrect field settings have been set for pair twin triple double twin Supposed Causes Defective indoor unit o...

Page 438: ...orrectly YES NO Are the micro computer normal monitors HAP of all indoor unit PCB blinking Connect correctly Is the indoor indoor 1 and indoor outdoor jumper correctly connected NO YES YES Connect cor...

Page 439: ...troller 432 YES NO Operating normally NO YES Connect correctly Replace the indoor unit PCB Is the indoor indoor and indoor outdoor jumper correctly connected Operates normally Turn OFF the power and t...

Page 440: ...m is more than limited For RZQG Incorrect combination indoor unit and outdoor unit Supposed Causes For RZQ C7 Indoor Outdoor Indoor Indoor transmission line Defective remote controller wiring For RZQG...

Page 441: ...system correct Check the setting for number of indoor units connected to the simultaneous ON OFF multi of the indoor unit Adopt only one of the remote controllers YES RZQG YES Remove the jumper Integ...

Page 442: ...2 connecting indoor and outdoor of the indoor unit NO Connect correctly Is the power supply PCB correctly connected Is 220 VAC between No 1 and 2 of X2M terminal indoor unit NO YES Connect correctly C...

Page 443: ...shooting by Remote Controller 436 YES YES NO Connect correctly B Does the system conduct normal operation Are the wires between indoor indoor and indoor outdoor correctly connected NO Replace the indo...

Page 444: ...een indoor units Error Decision Conditions When the micro computer judges that the centralized address signal is duplicated Supposed Causes Defective centralized address setting Defective indoor unit...

Page 445: ...its own on any other indoor unit Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is detected Supposed Causes Address duplication of centralized controll...

Page 446: ...ter checks if transmission between indoor unit and centralized controller is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes...

Page 447: ...pply of the indoor unit on which the UE occurred turned ON Has the setting of centralized control group No been made with the indoor unit on which the UE occurred Continued to C on the following page...

Page 448: ...III NET test run menu NO Can the setting of centralized control group No be made Was the centralized control group No for indoor unit changed NO Check whether or not there are no problems with the tra...

Page 449: ...ring NO Correct the connection of the connector C Check the transmission wiring between centralized controller for any broken wire Check the transmission wiring with the master unit centralized contro...

Page 450: ...sults from external factors e g noises from other equipment D Is the voltage between the terminals F1 and F2 in the range of 15 2 to 17 6 VDC Disconnect the transmission wiring of the master unit cent...

Page 451: ...transmission between indoor unit and centralized controller is normal Error Decision Conditions When transmission is not carried out normally for a certain amount of time Supposed Causes Transmission...

Page 452: ...O Reset power supply simultaneously for all optional controllers for centralized control Is the transmission wiring with the centralized controller disconnected or wired incorrectly Caution Be sure to...

Page 453: ...B Troubleshooting by Remote Controller 446 Is the centralized controller s connector for setting centralized controller disconnected YES Connect the connector correctly NO Replace the centralized cont...

Page 454: ...of the PCB to detect wrong wiring Supposed Causes Power supply wiring is broken or disconnected Mis connection of field wiring Troubleshooting Turn OFF the power supply and turn the power ON Caution...

Page 455: ...onding to that of indoor units that have made changes in temperature Error Decision Conditions The error is determined as soon as the abnormality aforementioned is detected through checking the system...

Page 456: ...ation carried out Is indoor outdoor and outdoor outdoor unit transmission wiring normal Open stop valve Is indoor outdoor and outdoor outdoor unit transmission wiring normal YES YES NO YES After fixin...

Page 457: ...temperature detected by the indoor heat exchanger thermistor and the indoor suction air thermistor B Difference in indoor suction air thermistor evaporation temperature Te or condensing temperature Tc...

Page 458: ...rval of HAP on outdoor unit PCB is short 1 for more than one minute Correctly connect transmission wiring between the indoor and outdoor units The phase of transmission wiring between the indoor and o...

Page 459: ...onds Normally ON for 0 4 second and OFF for 0 4 second Blink about 12 times for 10 seconds Refer to P 477 Refer to P 478 NO Recharge a proper amount of refrigerant after refrigerant recovery and vacuu...

Page 460: ...mistor R1T B Difference in evaporation temperature Te or condensation temperature Tc during heating operation detected by the indoor heat exchanger thermistor R2T and the compressor sensor Error Decis...

Page 461: ...ant after refrigerant collection and vacuum drying Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged YES NO Match the connection of the...

Page 462: ...computer when the power is supplied Error Decision Conditions When wiring connecting the indoor and outdoor units is not proper Supposed Causes Poor wiring connecting the indoor and outdoor units Trou...

Page 463: ...FMDQ A7 B7 Method of Error Detection Detect an indoor unit with no address setting Error Decision Conditions The error decision is made as soon as the abnormality aforementioned is detected Supposed...

Page 464: ...PCB for 5 seconds The unit will not run for up to 12 minutes Is indoor outdoor and outdoor outdoor unit transmission wiring normal 1 NO Normal Does an error occur NO NO Normal YES YES Caution Be sure...

Page 465: ...sion wiring with the installation manual YES Mount the DIII NET expander adaptor Disconnect the outdoor outdoor unit transmission wiring to create the one system status and then check whether or not t...

Page 466: ...n make sure that the resistance is more than the value mentioned in the following table For FBQ 2 With the fan motor connector disconnected measure the resistance between each pin then make sure that...

Page 467: ...hase is balanced and not short circuited Checking the Thermistors If the cause of the problem is related to the thermistors then the thermistors should be checked prior to changing the PCB To check th...

Page 468: ...k T C k 30 354 1 55 5 761 25 259 7 60 4 797 20 192 6 65 4 014 15 144 2 70 3 375 10 109 1 75 2 851 5 83 25 80 2 418 0 64 10 85 2 060 5 49 70 90 1 762 10 38 85 95 1 513 15 30 61 100 1 304 20 24 29 105...

Page 469: ...r liquid thermistor For remote controller thermistor T C k T C k 30 361 7719 40 10 6281 25 265 4704 45 8 7097 20 196 9198 50 7 1764 15 147 5687 55 5 9407 10 111 6578 60 4 9439 5 85 2610 65 4 1352 0 65...

Page 470: ...387 099 80 24 8586 10 1061 098 85 21 1360 5 817 9329 90 18 0377 0 635 0831 95 15 4487 5 496 5712 100 13 2768 10 391 0070 105 11 4395 15 309 9511 110 9 8902 20 247 2696 115 8 5788 25 198 4674 120 7 465...

Page 471: ...there is a temperature difference before and after EV capillary Check if the main valve unit of EV operates by noise vibration Is the check valve clogged Heat Pump model only Check if there is a tempe...

Page 472: ...e difference before and after EV capillary Check if the main valve unit of EV operates by noise vibration Is the check valve clogged Heat Pump model only Check if there is a temperature difference bef...

Page 473: ...r clogged Visual inspection Is there clogging before or after the EV capillary Check if there is a temperature difference before and after EV capillary Check if the main valve unit of EV operates by n...

Page 474: ...ccurs Visual inspection Is there clogging before or after the EV capillary Check if there is a temperature difference before and after EV capillary Check if the main valve unit of EV operates by noise...

Page 475: ...stor is DC 50V or less 4 After checking the residual electric charge remove the connector of the outdoor unit fan motor When the outdoor unit fan is rotated by strong headwind remove the connector of...

Page 476: ...resistance for one of the 3 phases in each table when the resistance value is equal to 5 times or more than the other resistance values the power transistor is broken In normal cases each phase shows...

Page 477: ...01_B Troubleshooting by Remote Controller 470 Voltage Measuring Method CHECK 7 Outdoor unit PCB Pressure sensor Micro computer A D input GND 5V Connector Red Red Black White 4 3 2 1 Measure DC voltage...

Page 478: ...Pressure Sensor for except RZQ S B RZQ C7 and CMSQ PH 1 38VH 0 69 PH High pressure MPa VH Output Voltage High Side VDC High Pressure PH This graph is available for both high pressure sensor and low p...

Page 479: ...Pressure Sensor for RZQ S B RZQ C7 and CMSQ High Pressure PH Low Pressure PL PH 1 38VH 0 69 PL 0 57VL 0 28 PH High pressure MPa PL Low pressure MPa VH Output Voltage High Side VDC VL Output Voltage L...

Page 480: ...ting by Remote Controller Si20 701_B 473 Electronic Expansion Valve Connector and Coil Resistance Criteria Measurement point Criteria 1 5 40 50 3 5 2 6 4 6 CHECK 8 1 2 3 4 5 6 Orange Red Yellow Black...

Page 481: ...nnected Are the thermistor resistance characteristics normal Is the pressure value checked with the Service Checker corresponding to the measurement of the sensor Defective valve coil Defective valve...

Page 482: ...nosis of excessive refrigerant charging In cooling operation 1 Because high pressure rises due to excessive charging overload control is carried out and capacity tends to run short 2 Considering press...

Page 483: ...rotection control Minimum frequency Minimum frequency Electronic expansion valve opening degree decreases due to wet protection control Electronic expansion valve opening degree decreases due to wet p...

Page 484: ...n etc Replace the electronic expansion valve 2 Accumulator Frosting Choked moisture Blow a nitrogen gas and then replace the refrigerant 3 Distributor Temperature difference Dust Choked moisture Reduc...

Page 485: ...ator capacity caused by refrigerant shortage capacity is controlled in the inverter in order to maintain low pressure which results in a decrease in frequency 3 Because of 1 and 2 above the compressor...

Page 486: ...gree reaches the maximum suction superheated degree increases Reaches the lowest frequency Inadequate In response to decreased evaporator capacity caused by refrigerant shortage capacity is controlled...

Page 487: ...n order to prevent oil to the outdoor unit heat exchanger from being retained 3 Because of 1 and 2 above evaporator capacity and compressor frequency decrease despite a large difference large load bet...

Page 488: ...he inverter in order to maintain high pressure which resulting in a rise in frequency Drooping control by suction superheat degree Prevention of oil to heat exchanger from being retained Suction super...

Page 489: ...eration OFF and power OFF Connect the connector 5 Check whether 2 pulses 0 and 5 VDC are output 4 times at the pins 1 4 when the fan motor is rotated 1 turn by hand Check Measure If NG in steps 2 and...

Page 490: ...onitor PCB Defective valve coil Defective valve body Defective high pressure sensor Defective indoor unit liquid pipe thermistor Defective service monitor PCB A temperature difference in excess of 10...

Page 491: ...less than 27 C Is the room temperature less than 27 C Is the connector properly connected Are the thermistor resistance characteristics normal Defective outdoor air temperature thermistor of outdoor u...

Page 492: ...normal Check for the thermistor resistance and connection Check for the thermistor resistance and connection Is the pressure value checked with the Service Checker corresponding to the measurement val...

Page 493: ...ctor properly connected Are the thermistor resistance characteristics normal Is the connector properly connected Are the thermistor resistance characteristics normal Does the piping length fall in the...

Page 494: ...control 2 The low pressure protection control includes low pressure protection control and hot gas bypass control 3 In cooling the indoor unit electronic expansion valve is used for superheated degre...

Page 495: ...by the use of a multiple tester Items to be prepared 1 Multiple tester Prepare the analog type of multiple tester For the digital type of multiple tester those with diode check function are available...

Page 496: ...ection describes supposed causes of the defective inverter 1 Defective compressor ground leakage 1 Defective fan motor ground leakage 1 Entry of conductive foreign particles 1 Abnormal voltage e g ove...

Page 497: ...tance due to capacitor charge or else 5 V P3 6 W P3 7 N3 U 8 N3 V 9 N3 W 10 U N3 2 to 15k 11 V N3 12 W N3 When using the digital type of multiple tester make measurement in diode check mode No Measuri...

Page 498: ...e to capacitor charge or else 5 J2 P1 6 J3 P1 7 N3 J1 8 N3 J2 9 N3 J3 10 J1 N3 2 to 15k 11 J2 N3 12 J3 N3 When using the digital type of multiple tester make measurement in diode check mode No Measuri...

Page 499: ...of the Outdoor Unit A short circuited conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the unified ON OFF controller If there is no continuity as well conduct con...

Page 500: ...the Indoor Unit c and transmission wiring of the Indoor Unit d in the order described If the place with continuity can be identified there may be broken wires in places before the said place with cont...

Page 501: ...ailer Cautions on product corrosion 1 Air conditioners should not be installed in areas where corrosive gases such as acid gas or alkaline gas are produced 2 If the outdoor unit is to be installed clo...

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