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Daikin 2AMKS40BVMB, Pocket Manual

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Daikin 2AMKS40BVMB Pocket Manual Download Page 145

Troubleshooting

Si10-417

144

Service Diagnosis

5.3.10 Outdoor Unit PCB Abnormality or Signal

   Transmission Circuit Abnormality

Remote 
Controller 
Display

U4

Method of 
Malfunction 
Detection

The data received from the outdoor unit in indoor unit-
outdoor unit signal transmission is checked whether it is 
normal.

Malfunction 
Decision 
Conditions

When the data sent from the outdoor unit cannot be 
received normally, or when the content of the data is 
abnormal.
If the indoor unit cannot communicate with the outdoor 
unit for 15 seconds, the system will be shut down.

Supposed 
Causes

„

Faulty outdoor unit PCB.

„

Faulty indoor unit PCB.

„

Indoor unit-outdoor unit signal transmission error due 
to wiring error.

„

Indoor unit-outdoor unit signal transmission error due 
to breaking of wire in the connection wires between 
the indoor and outdoor units (the transmission wire).

Si10-417.fm  Page 144  Wednesday, September 22, 2004  6:38 PM

Summary of Contents for 2AMKS40BVMB

Page 1: ...Service Diagnosis SPLIT MULTI Si10 417 Pocket Manual Cover fm Page 1 Wednesday September 22 2004 6 36 PM...

Page 2: ...error code 6 3 List of applicable models 11 3 1 Indoor Units 11 3 2 Outdoor Units 17 4 Error Codes and Description of Fault 21 4 1 Indoor Unit 21 4 2 Outdoor Unit 22 4 3 System 23 5 Troubleshooting 2...

Page 3: ...oor unit is activated or when the thermistor malfunctions disabling equipment operation 2 When a signal transmission error occurs between the indoor and outdoor units In either case conduct the diagno...

Page 4: ...LED Service Diagnosis 3 Floor Ceiling Suspended Dual Type Floor Standing Type Duct Connected Type OPERATION lamp green ON OFF OPERATION lamp green OPERATION lamp green Si10 417 fm Page 3 Wednesday Sep...

Page 5: ...4 Service Diagnosis 1 2 Outdoor Unit Pair The outdoor unit has one green LED LED A on the PCB The flashing green LED indicates normal condition of microcomputer operation Si10 417 fm Page 4 Wednesday...

Page 6: ...and the OFF condition of the red LED indicates normal equipment condition Troubleshooting with the green LED The LED A green of the outdoor unit indicate microcomputer operation condition Even after...

Page 7: ...Diagnosis 2 Diagnosis by Remote Controller 2 1 To know the error code Method 1 1 When the timer cancel button is held down for 5 seconds a 00 indication flashes on the temperature display section Si10...

Page 8: ...o consecutive beeps indicate non corresponding codes 2 To cancel the code display hold the timer cancel button down for 5 seconds The code display also cancels itself if the button is not pressed for...

Page 9: ...s the 3 buttons TEMP TEMP MODE simultaneously The digit of the number of tens blinks Try again from the start when the digit does not blink 2 Press the TEMP button Press TEMP or TEMP and change the di...

Page 10: ...r of tens accords with the error code beep The both numbers of tens and units accord with the error code See 7 4 Enter the diagnosis mode again Press the MODE button The digit of the number of units b...

Page 11: ...i The number of tens accords with the error code beep The both numbers of tens and units accord with the error code 7 Determine the error code The digits indicated when you hear the beep sound are err...

Page 12: ...VM A T 2 ATKS25BVMB 1 FTK71AVM A T 2 ATKS25CVMB 9 1 FTKD18BVMS 2 ATKS35BVMB 1 FTKD24BVMS 2 ATKS35CVMB 9 1 FTKD28BVMS 2 ATX25BVMB 1 FTKD50BVM 2 ATX35BVMB 1 FTKD50BVMA 9 2 ATXS20CVMB 9 1 FTKD50BVMD 2 AT...

Page 13: ...BV4 9 2 FTN20CVMB9 1 FTXD50BVMA 9 2 FTN25CVMB9 1 FTXD50BVMC 2 FTN35CVMB9 1 FTXD50BVMT 2 FTS20BVMB 1 FTXD50CMV2C 2 FTS25BVMB 1 FTXD60BMVMC 2 FTS35BVMB 1 FTXD60BVMA 9 2 FTS50BVMB 2 FTXD60BVMC 2 FTS60BVM...

Page 14: ...FTYN20CVMB9 1 FTXS35BVMB A 1 FTYN25CVMB9 1 FTXS35CVMB 9 8 1 FTYN35CVMB9 1 FTXS50BVMA 9 2 FTYS20BVMB 1 FTXS50BVMB 2 FTYS25BVMB 1 FTXS60BVMA 9 2 FTYS35BVMB 1 FTXS60BVMB 2 FTYS50BVMB 2 FTXS71BVMA 9 2 FTY...

Page 15: ...on No FVK25AZVMB 2 FVK35AZVMB 2 FVK50AZVMB 2 FVKS25BVMB 2 FVKS35BVMB 2 FVKS50BVMB 2 FVX25AZVMB 2 FVX35AZVMB 2 FVX50AZVMB 2 FVX56AV1C 2 FVXD56CMV2C 2 FVXD68CMV2C 2 FVXS25BVMB 2 FVXS35BVMB A 2 FVXS50BVM...

Page 16: ...1 CDK60AVM 1 CDXD35AVMC 1 CDK60AVMA 1 CDXD35BMVMC 1 CDK60AVMD 1 CDXD35CMVMC 1 CDK60AZVMB 1 CDXD35CVMA 1 CDKD25CVM A 1 CDXD50AVMC 1 CDKD35CVM A 1 CDXD50CVMA 1 CDKD50CVM A 1 CDXD60AVMC 1 CDKD60CVM A 1...

Page 17: ...BVMB 1 FLK50AVMA 1 FLK50AVMD 1 FLK50AZVMB 1 FLK60AVMA 1 FLK60AVMD 1 FLK60AZVMB 1 FLKS25BVMB 1 FLKS35BVMB 1 FLKS50BVMB 1 FLKS60BVMB 1 FLX25AVMA 1 FLX25AZVMB 1 FLX25BVMB 1 FLX35AVMA 1 FLX35AZVMB 1 FLX35...

Page 18: ...ARK25BVMB 3 3MK75AVMA 5 ARK35BVMB 3 3MK75AVMT 5 ARKH20CVMB9 3 3MKD58BVM 5 ARKH25CVMB9 3 3MKD75BVM 5 ARKH35CVMB9 3 3MKD75BVMA 5 ARKS25BVMB 3 3MKD75BVMT 5 ARKS35BVMB 3 3MKS50BVMB 5 ARX25BVMB 3 3MX52AZV...

Page 19: ...K35BVMB 3 RKE35BVM 3 RK35JAVET 3 RKE35BVMA 3 RK35JV1NB9 3 RKE35BVMT 3 RK35JVE9 3 RKH20CVMB9 3 RK35JVEA9 3 RKH25CVMB9 3 RKD18BVMS 4 RKH35CVMB9 3 RKD24BVMS 4 RKS25BVMB 3 RKD25KZV1B 3 RKS35BVMB 3 RKD28BV...

Page 20: ...B 4 RX35JAVET 3 RXD71JV1B5 4 RX35JV1NB5 3 RXD71JVEA 4 RX35JV1NB9 3 RXD71JVET 4 RX35JVEA9 3 RXD80BVMA 4 RX35LV1C 3 RXD80CV4 4 RX35LV1C9 3 RXE25BVMA 3 RX50AZVMB 4 RXE25BVMT 3 RX50JV4N 4 RXE25CMV2C 3 RX5...

Page 21: ...60BVMB 4 RYN35CVMB9 3 RXS71BVMA 4 RYS20BVMB 3 RXS71BVMB 4 RYS25BVMB 3 RY25CVMA 3 RYS35BVMB 3 RY35CVMA 3 RYS50BVMB 4 RYN20CVMB9 3 RYS60BVMB 4 Model Classification No Model Classification No Refer the c...

Page 22: ...elated page 1 2 A1 Indoor unit PCB abnormality 24 24 A5 Freeze up protection function or high pressure control 25 25 A6 Fan motor or related abnormality 27 29 C4 Heat exchanger temperature thermistor...

Page 23: ...control in cooling 74 74 75 H6 Position sensor abnormality 77 79 81 83 H8 CT or related abnormality 85 87 89 91 H9 Outdoor air thermistor or related abnormality 93 93 95 97 J3 Discharge pipe thermisto...

Page 24: ...130 133 U2 Low voltage detection 137 138 Over voltage detection 136 140 U4 Signal transmission error between indoor and outdoor units 142 142 142 Outdoor unit PCB abnormality or signal transmission c...

Page 25: ...y depending on models Control connector Connector connection check note YES Is it normal NO Correct connections Replace PCBs R1400 Caution Be sure to turn off power switch before connect or disconnect...

Page 26: ...e detected by the indoor unit heat exchanger thermistor Malfunction Decision Conditions High pressure control During heating operations the temperature detected by the indoor heat exchanger thermistor...

Page 27: ...e intake air filter Check the air passage YES YES R1401 Check the dust accumulation on the indoor unit heat exchanger YES YES Is there any short circuit Is it very dirty Is it very dirty NO Provide su...

Page 28: ...s Operation halt due to faulty capacitor of the fan motor Detection error due to faulty indoor unit PCB Trouble shooting Check No 16 Refer to P 167 Rotate the fan by hand Operate the fan Does it rotat...

Page 29: ...k No 16 Check hall IC Is there an output Is it at the rated voltage Check the fan motor voltage NO NO YES YES Replace the fan motor or indoor unit PCB Replace indoor unit PCB 1 Replace the fan motor A...

Page 30: ...on Decision Conditions When the detected rotation speed is less than 50 of the H tap under maximum fan motor rotation demand Supposed Causes Operation halt due to short circuit inside the fan motor wi...

Page 31: ...ower supply and rotate fan by hand Turn power ON and operate fan Does it rotate Stop fan motor Is rotation number command pulse generated Check No 01 Check output of fan motor connector Does fan rotat...

Page 32: ...DC 200V generated Is motor control power voltage DC 15V generated Turn off power supply and dis connect fan motor connector then turn power ON again Is rotation number command pulse generated Check N...

Page 33: ...C more than 1 860 kohms Note The values vary slightly in some models Supposed Causes Faulty connector connection Faulty thermistor Faulty PCB Trouble shooting Check No 6 Refer to P 157 C4 Heat exchang...

Page 34: ...t switch defective Shutter itself deformed warped Shutter s sealing material too thick Detection error by broken relay harness or disconnected connector Detection error due to defective PCB 2 Foreign...

Page 35: ...ter for deformation or its sealing material NO 2A Shutter opening itself YES Q0346 Reconnect the connector or replace the relay harness Replace the shutter drive motor or the PC board 2 YES NO Relay h...

Page 36: ...nditions A and B are kept together for 5 minutes A Indoor unit heat exchanger temperature 1 C B Indoor unit heat exchanger temperature Room temperature 10 C If the indoor unit anti icing function is a...

Page 37: ...istor Replace the room temperature thermistor Replace the room temperature thermistor or indoor unit heat exchanger thermistor Do the vacuum drying Replace the indoor unit PCB R3039 Wiring or piping o...

Page 38: ...B are kept together for 5 minutes A Indoor unit heat exchanger temperature 1 C B Indoor unit heat exchanger temperature Room temperature 10 C If the indoor unit icing protector is activated four times...

Page 39: ...perature thermistor Replace the room temperature thermistor or indoor unit heat exchanger thermistor Do the vacuum drying Replace the indoor unit PCB and then start the wiring error check mode R3059 W...

Page 40: ...o P 151 Check No 5 2 Refer to P 156 Check No 6 Refer to P 157 Check No 11 Refer to P 162 Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred...

Page 41: ...o P 151 Check No 5 1 Refer to P 155 Check No 6 Refer to P 157 Check No 11 Refer to P 162 Discharge pipe thermistor disconnected Check No 11 Check the refrigerant line Check No 6 Check the thermistors...

Page 42: ...or OL is activated twice the system will be shut down The error counter will reset itself if this or any other error does not occur during the following 60 minute compressor running time total time Th...

Page 43: ...switch before connect or disconnect connector or parts damage may be occurred Insert the thermistor in position Replace the discharge pipe thermistor Replace the valve itself or the coil Replace the...

Page 44: ...Compressor locked Trouble shooting Note If the model doesn t have SPM replace the outdoor unit PCB Turn off the power Disconnect the harnesses U V and W Inverter checker Part No 1225477 Correct the po...

Page 45: ...Continuous run for about 5 minutes normal Supposed Causes Compressor locked Trouble shooting Caution Turn off the power Disconnect the harnesses U V and W System shut down after errors repeated sever...

Page 46: ...ncy of above 180 Hz The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes normal Supposed Causes Compressor locked Trouble shooting Caution Tu...

Page 47: ...6 Service Diagnosis System shut down after errors repeated several times YES NO Check the electronic expansion valve Replace it as required Replace the compressor R2842 A Si10 417 fm Page 46 Wednesday...

Page 48: ...he model doesn t have SPM replace the outdoor unit PCB Caution Turn off the power Disconnect the harnesses U V and W System shut down after errors repeated several times Normal Emergency stop without...

Page 49: ...osed Causes Fan motor breakdown Harness or connector disconnected between fan motor and PCB or in poor contact Foreign matters stuck in the fan Trouble shooting Check No 15 1 2 Refer to P 165 Turn off...

Page 50: ...minutes normal Supposed Causes Fan motor breakdown Harness or connector disconnected between fan motor and PCB or in poor contact Foreign matters stuck in the fan Trouble shooting Check No 15 1 2 Refe...

Page 51: ...rt circuit Trouble shooting Check No 7 1 Refer to P 158 Check No 8 Refer to P 160 Replace the outdoor unit PCB Inverter checker Part No 1225477 Correct the power supply or replace the SPM Replace the...

Page 52: ...ve SPM replace the outdoor unit PCB R2952 Turn off the power and reconnect the harnesses Turn on the power again and get restarted Check No 8 Check the discharge pressure Check No 7 1 Check the instal...

Page 53: ...ssor running continues for 2 5 seconds CT input Above 20 A The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes normal Supposed Causes Over c...

Page 54: ...ower supply or replace the SPM Replace the outdoor unit PCB R2844 Input current flowing above its stop level NO YES NO Normal Any LED off YES NO Check with the inverter checker Turn off the power and...

Page 55: ...T input with the compressor running continues for 2 5 seconds CT input Above 20 A The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes normal...

Page 56: ...ower supply or replace the SPM Replace the outdoor unit PCB R2844 Input current flowing above its stop level NO YES NO Normal Any LED off YES NO Check with the inverter checker Turn off the power and...

Page 57: ...ssor running continues for 2 5 seconds CT input Above 11 A The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes normal Supposed Causes Over c...

Page 58: ...er Part No 1225477 Correct the power supply or replace the SPM Replace the outdoor unit PCB R2844 Input current flowing above its stop level NO YES NO Normal Any LED off YES NO Check with the inverter...

Page 59: ...in the operating mode Malfunction Decision Conditions A following condition occurs after 3 minutes of the compressor start Cooling dry operation outdoor unit heat exchanger temp liquid pipe temp 5 C H...

Page 60: ...No 11 Check the refrigerant line l Insufficient gas l Water mixed l Stop valve defective YES YES Harness out of connector NO YES Disconnect the harness from the connector Resistance between harnesses...

Page 61: ...within their normal ranges in the operating mode Malfunction Decision Conditions A following condition continues over 10 minute after operating 5 minutes Cooling dry operation room temp indoor heat ex...

Page 62: ...No 11 Check the refrigerant line l Insufficient gas l Water mixed l Stop valve defective YES YES Harness out of connector NO YES Disconnect the harness from the connector Resistance between harnesses...

Page 63: ...in their normal ranges in the operating mode Malfunction Decision Conditions A following condition continues over 1 minute after operating 10 minutes Cooling dry operation room temp indoor heat exchan...

Page 64: ...o 11 Check the refrigerant line l Insufficient gas l Water mixed l Stop valve defective YES YES NO Harness out of connector NO YES Disconnect the harness from the connector Resistance between harnesse...

Page 65: ...he operating mode Malfunction Decision Conditions Either of the following conditions occurs 3 minutes after the compressor has started Cooling dry operation Outdoor unit heat exchanger temperature Liq...

Page 66: ...ck the thermistors Check the continuity of the four way valve coil and harness Correct Reconnect Replace the four way valve coil Replace the outdoor unit PC board Reconnect in position Replace a defec...

Page 67: ...The error is cleared when the temperature has dropped below C Stop temperatures The error counter will reset itself if this or any other error does not occur during the following 60 minute compressor...

Page 68: ...defective Replace a defective thermistor Replace the valve itself or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB R2846 Check No 6 Check the thermistors Malfunct...

Page 69: ...pressor will stop The error is cleared when the temperature has dropped below 107 C Stop temperatures in case of 5 0kW class 1 110 C above 45Hz rising above 40Hz dropping 2 102 C 30 45Hz rising 25 40H...

Page 70: ...defective Replace a defective thermistor Replace the valve itself or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB R2846 Check No 6 Check the thermistors Malfunct...

Page 71: ...ror is cleared when the temperature has dropped below 107 C Stop temperatures in the case of 3MXS52BVMB 1 110 C when the frequency rises above 45 Hz or drops below 40 Hz 2 102 C when the frequency ris...

Page 72: ...defective Replace a defective thermistor Replace the valve itself or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB R2846 Check No 6 Check the thermistors Malfunct...

Page 73: ...C the compressor will stop The error is cleared when the temperature has dropped below 97 C Stop temperatures 1 110 C above 45Hz rising above 40Hz dropping 2 102 C 30 45Hz rising 25 40Hz dropping 3 9...

Page 74: ...defective Replace a defective thermistor Replace the valve itself or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB R2846 Check No 6 Check the thermistors Malfunct...

Page 75: ...valve Dirty heat exchanger Trouble shooting Check No 4 Refer to P 151 Check No 6 Refer to P 157 Check No 7 1 Refer to P 158 Check No 9 Refer to P 160 R2855 Replace the fan motor Repair the connector o...

Page 76: ...stor exceeds the limit Malfunction Decision Conditions Activated when the temperature being sensed by the heat exchanger thermistor rises above 54 C Deactivated when the said temperature drops below 5...

Page 77: ...ce the PCB Change the air outlet grille position Change the installation location Clean the heat exchanger Check the installation space Check No 9 Outdoor fan check Judgment Check No 6 Heat exchanger...

Page 78: ...ection circuit Malfunction Decision Conditions The compressor fails to start in about 15 seconds after the compressor run command signal is sent Clearing condition Continuous run for about 5 minutes n...

Page 79: ...the compressor R3041 Normal NO NO YES YES NO YES YES Any LED off NO DC290 380V Electricals or compressor harnesses connected as specified Check the electrolytic capacitor voltage Check with the invert...

Page 80: ...Malfunction Decision Conditions The compressor fails to start in about 15 seconds after the compressor run command signal is sent Clearing condition Continuous run for about 5 minutes normal The syst...

Page 81: ...Replace the compressor R2847 Normal NO NO YES YES NO YES YES Any LED off NO DC380 30V Electricals or compressor harnesses connected as specified Check the electrolytic capacitor voltage Check with th...

Page 82: ...ition detection circuit Malfunction Decision Conditions The compressor fails to start in about 15 seconds after the compressor run command signal is sent Clearing condition Continuous run for about 5...

Page 83: ...Replace the compressor R2847 Normal NO NO YES YES NO YES YES Any LED off NO DC380 30V Electricals or compressor harnesses connected as specified Check the electrolytic capacitor voltage Check with th...

Page 84: ...t Malfunction Decision Conditions The compressor is not running in about 15 seconds after the compressor run command signal is sent Clearing condition Continuous run for about 5 minutes normal The sys...

Page 85: ...the compressor R3041 Normal NO YES NO YES Any LED off NO NO YES DC290 380V Check the electrolytic capacitor voltage Check with the inverter checker Turn off the power Disconnect the harnesses U V and...

Page 86: ...transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Trouble shooting Check No 12 Refer to P 163 Turn off the power and turn it on again Check No...

Page 87: ...Replace the outdoor unit PCB Replace the outdoor unit PCB Replace the compressor Any LED off Compressor running NO YES YES NO Turn off the power Disconnect the harnesses U V and W Turn off the power a...

Page 88: ...transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Trouble shooting Check No 12 Refer to P 163 Turn off the power and turn it on again Check N...

Page 89: ...lace the outdoor unit PCB Replace the compressor Any LED off Compressor running NO YES YES NO Turn off the power Disconnect the harnesses U V and W Turn off the power and reconnect the above harnesses...

Page 90: ...nditions The compressor running frequency is below 55 Hz and the CT input is below 0 1 V The input current is also below 1 25 A If this error repeats 4 times the system will be shut down The error cou...

Page 91: ...Time Capacitor charged when the indoor unit or outdoor unit main relay turns on Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred DC380 3...

Page 92: ...transistor defective Internal wiring broken or in poor contact Reactor defective Outdoor unit PCB defective Trouble shooting Check No 12 Refer to P 163 DC290 380V Turn off the power and turn it on ag...

Page 93: ...e SPM Replace the outdoor unit PCB Replace the outdoor unit PCB Replace the compressor Any LED off Compressor running NO YES YES NO Turn off the power Disconnect the harnesses U V and W Turn off the p...

Page 94: ...onditions The thermistor input is above 4 96 V or below 0 04 V with the power on Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature Su...

Page 95: ...l Outdoor air thermistor Replace the following thermistor l Indoor unit heat exchanger thermistor Replace the outdoor unit PCB Replace the indoor unit PCB Error displayed again on remote controller NO...

Page 96: ...nditions When the thermistor input is above 4 96 V or below 0 04 V with the power on the J3 error is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temper...

Page 97: ...n thermistor l Discharge pipe temperature thermistor l Outdoor unit heat exchanger temperature thermistor l Liquid pipe thermistor l Gas pipe thermistor l Outdoor temperature thermistor Replace the fo...

Page 98: ...r below 0 04 V with the power on Error J3 is judged if the discharge pipe thermistor temperature is smaller than the condenser thermistor temperature In case of J8 or J9 the system will be shut down w...

Page 99: ...No 6 Check the thermistor resistance value Check No 6 Check the indoor unit heat exchanger thermistor resistance value in the heating mode Caution Be sure to turn off power switch before connect or d...

Page 100: ...le shooting Check No 6 Refer to P 157 Check No 7 1 Refer to P 158 Check No 9 Refer to P 160 Turn off the power and turn it on again Replace the fan motor Correct the connectors and fan motor leads Rep...

Page 101: ...hermistor resistance value Replace the fin thermistor Replace the outdoor unit PCB l Fin thermistor Thermistor as specified in its characteristic chart Above 122 C YES NO NO YES Check the radiation fi...

Page 102: ...PCB defective Trouble shooting Check No 6 Refer to P 157 Check No 7 1 Refer to P 158 Check No 9 Refer to P 160 Turn off the power and turn it on again Replace the fan motor Correct the connectors and...

Page 103: ...thermistor resistance value Replace the fin thermistor Replace the outdoor unit PCB l Fin thermistor Thermistor as specified in its characteristic chart Above 80 C YES NO NO YES Check the radiation fi...

Page 104: ...oor contact Outdoor unit PCB defective Trouble shooting Check No 6 Refer to P 157 Check No 7 1 Refer to P 158 Check No 9 Refer to P 160 Turn off the power and turn it on again Replace the fan motor Co...

Page 105: ...thermistor resistance value Replace the fin thermistor Replace the outdoor unit PCB l Fin thermistor Thermistor as specified in its characteristic chart Above 90 C YES NO NO YES Check the radiation fi...

Page 106: ...PCB defective Trouble shooting Check No 6 Refer to P 157 Check No 7 2 Refer to P 159 Check No 9 Refer to P 160 Turn off the power and turn it on again Replace the fan motor Correct the connectors and...

Page 107: ...thermistor resistance value Replace the fin thermistor Replace the outdoor unit PCB l Fin thermistor Thermistor as specified in its characteristic chart Above 80 C YES NO NO YES Check the radiation fi...

Page 108: ...mperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Trouble shooting Check No 6 Ref...

Page 109: ...r as specified in its characteristic chart Above 81 C YES NO NO YES Check the radiation fin temperature A B Replace the fin thermistor Check the power transistor and fin for looseness If they are foun...

Page 110: ...mperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Trouble shooting Check No 6 Ref...

Page 111: ...Check the power transistor and fin for looseness If they are found to be fit tightly replace the PCB or the power transistor R2851 Thermistor as specified in its characteristic chart Above 90 C YES N...

Page 112: ...g the following 60 minute compressor running time total time Supposed Causes Fin temperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective C...

Page 113: ...r as specified in its characteristic chart Above 90 C YES NO NO YES Check the radiation fin temperature A B Replace the fin thermistor Check the power transistor and fin for looseness If they are foun...

Page 114: ...mperature rise due to defective outdoor unit fan Fin temperature rise due to short circuit Fin thermistor defective Connector in poor contact Outdoor unit PCB defective Trouble shooting Check No 6 Ref...

Page 115: ...Check the power transistor and fin for looseness If they are found to be fit tightly replace the PCB or the power transistor R2851 Thermistor as specified in its characteristic chart Above 90 C YES N...

Page 116: ...rrent input is fed from the output over current detection circuit to the microcomputer The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes n...

Page 117: ...to get the system started See if the same error occurs Turn off the power and disconnect the harnesses U V and W Check with the inverter checker An output over current may result from wrong internal...

Page 118: ...il phases NO YES Normal Monitor the supply voltage discharge and suction pressures and other factors for a long term Possible causes l Instantaneous supply voltage drop l Compressor motor overloaded l...

Page 119: ...ning An output over current input is fed from the output over current detection circuit to the microcomputer The system will be shut down if the error occurs 16 times Clearing condition Continuous run...

Page 120: ...YES NO Any LED off Turn off the power and turn it on again to get the system started See if the same error occurs Turn off the power and disconnect the harnesses U V and W Check with the inverter chec...

Page 121: ...or breakage between compressor s coil phases NO YES Normal Monitor the supply voltage discharge and suction pressures and other factors for a long term Possible causes l Instantaneous supply voltage...

Page 122: ...rrent input is fed from the output over current detection circuit to the microcomputer The system will be shut down if the error occurs 16 times Clearing condition Continuous run for about 5 minutes n...

Page 123: ...YES NO Any LED off Turn off the power and turn it on again to get the system started See if the same error occurs Turn off the power and disconnect the harnesses U V and W Check with the inverter chec...

Page 124: ...or breakage between compressor s coil phases NO YES Normal Monitor the supply voltage discharge and suction pressures and other factors for a long term Possible causes l Instantaneous supply voltage...

Page 125: ...Voltage However when the status of running frequency Hz is kept on for a certain time Note The values are different from model to model Gas shortage detection II If a gas shortage error takes place 4...

Page 126: ...closed NO YES Check the CT YES NO Gas shortage error again YES NO Oil oozing at internal piping NO YES Check No 4 Electronic expansion valve functioning YES NO Oil oozing at relay pipe connections Che...

Page 127: ...ontact Correct as required Also replace cracked pipe if any Replace the room temperature or outdoor air thermistor or the indoor unit or outdoor unit heat exchanger thermistor 1 Replace the PCB 2 Repl...

Page 128: ...ge However when the status of running frequency 55 Hz is kept on for a certain time Note The values are different from model to model Gas shortage detection II If a gas shortage error takes place 4 ti...

Page 129: ...closed NO YES Check the CT YES NO Gas shortage error again YES NO Oil oozing at internal piping NO YES Check No 4 Electronic expansion valve functioning YES NO Oil oozing at relay pipe connections Che...

Page 130: ...ontact Correct as required Also replace cracked pipe if any Replace the room temperature or outdoor air thermistor or the indoor unit or outdoor unit heat exchanger thermistor 1 Replace the PCB 2 Repl...

Page 131: ...current 8 78 256 A Hz x Compressor running frequency 0 25 However when the status of running frequency 55 Hz is kept on for a certain time Note The values are different from model to model Gas shorta...

Page 132: ...closed NO YES Check the CT YES NO Gas shortage error again YES NO Oil oozing at internal piping NO YES Check No 4 Electronic expansion valve functioning YES NO Oil oozing at relay pipe connections Che...

Page 133: ...ontact Correct as required Also replace cracked pipe if any Replace the room temperature or outdoor air thermistor or the indoor unit or outdoor unit heat exchanger thermistor 1 Replace the PCB 2 Repl...

Page 134: ...are different from model to model Gas shortage detection II When the condition of the following 1 3 continued for a certain time 1 During discharge pipe temperature control 2 Discharge pipe temp 255 2...

Page 135: ...closed NO YES Check the CT YES NO Gas shortage error again YES NO Oil oozing at internal piping NO YES Check No 4 Electronic expansion valve functioning YES NO Oil oozing at relay pipe connections Che...

Page 136: ...ontact Correct as required Also replace cracked pipe if any Replace the room temperature or outdoor air thermistor or the indoor unit or outdoor unit heat exchanger thermistor 1 Replace the PCB 2 Repl...

Page 137: ...utes normal Supposed Causes Supply voltage not as specified Over voltage detection circuit defective PAM control part s defective Trouble shooting Note If the model doesn t have SPM replace the outdoo...

Page 138: ...minutes normal Supposed Causes Supply voltage not as specified Over voltage detector or DC voltage detection circuit defective PAM control part s defective Trouble shooting Check the supply voltage Co...

Page 139: ...ns An over voltage signal is fed from the over voltage detection circuit to the microcomputer or the voltage being detected by the DC voltage detection circuit is judged to be below 150 V for 0 1 seco...

Page 140: ...ed NO Repeat a couple of times YES Disturbance factors Noise Power supply distortion A A Caution Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred...

Page 141: ...ltage signal is fed from the over voltage detection circuit to the microcomputer or more than 430 V occurred the voltage detected by the DC voltage detection circuit The system will be shut down if th...

Page 142: ...et restarted a couple of times R2854 Supply voltage as specified NO YES Turn on the power again System restarted NO Repeat a couple of times YES Precaution before turning on the power again Make sure...

Page 143: ...e data sent from the outdoor unit cannot be received normally or when the content of the data is abnormal Supposed Causes Faulty outdoor unit PCB Faulty indoor unit PCB Indoor unit outdoor unit signal...

Page 144: ...oor unit control PCB Locate the cause of the disturbance of the power supply waveform and correct it Is there any wiring error NO R2840 Is LED A flashing Is the voltage 0 V NO Check No 10 Check power...

Page 145: ...sent from the outdoor unit cannot be received normally or when the content of the data is abnormal If the indoor unit cannot communicate with the outdoor unit for 15 seconds the system will be shut d...

Page 146: ...Is there any wiring error R3046 Not enough YES The connection wiring length over 30m NO Fully insulated ex between wirings earth Fine NO Check the outdoor unit s LED A NO Is LED A flashing YES Discon...

Page 147: ...ndoor unit PCB mounted Indoor unit PCB defective Wrong outdoor unit PCB mounted or defective Trouble shooting Check the indoor and outdoor unit model numbers Match the compatible models Change for the...

Page 148: ...internal and or external voltages Operation halt due to mismatching of indoor and outdoor units Supposed Causes Operation halt due to the anti icing function in other rooms Wrong connections at the in...

Page 149: ...cified voltage between indoor and outdoor units Supposed Causes Operation halt due to the anti icing function in other rooms Wrong connections at the indoor unit PCB wrongly connected Trouble shooting...

Page 150: ...eference potential Motor control voltage 15 VDC Rotation command voltage 1 6 VDC Rotation pulse input S1 R3199 7 6 5 4 3 2 1 Motor power supply voltage Unused Unused P 0V reference potential Motor con...

Page 151: ...in pan assembly Check the continuity of the switch connection The shutter can be opened and closed with hand Keep the shutter open and closed all the way for each continuity check steps 5 4 3 2 1 Moto...

Page 152: ...nductivity between pins 1 3 and 6 and between pins 2 4 and 5 If there is no conductivity between the pins the EV coil is faulty 4 If no EV generates latching sound in the above step 2 the outdoor unit...

Page 153: ...Check the conductivity between pins 1 3 and 6 and between pins 2 4 and 5 If there is no conductivity between the pins the EV coil is faulty 4 If no EV generates latching sound in the above step 2 the...

Page 154: ...ing problem does not cool the room When the only faulty unit is in operation the unit makes pump down The low pressure of the unit becomes vacuum IT is activated Abnormal discharge pipe temperature He...

Page 155: ...e pipe temperature Check the number of rotation of shaft if it is 5 and half from full open to complete close using manual coil for electronic expansion valve When the number of rotation of shaft is l...

Page 156: ...ur way valve coil Replace the four way valve R2856 NO Four way valve coil Cooling dry No continuity Heating Continuity YES YES Four way valve coil resistance at 1500 NO S80 voltage at DC 180 220 V wit...

Page 157: ...lace the four way valve Four way valve coil Cooling dry No continuity Heating Continuity YES YES NO S80 voltage at DC 180 220 V with compressor on Fig 1 Disconnect the four way valve coil from the con...

Page 158: ...e the resistance of each thermistor using tester The relationship between normal temperature and resistance is shown in the graph and the table below Thermistor R25 C 20k B 3950 Temperature C 20 211 0...

Page 159: ...ion location or direction Check the outside air temperature temperature of air taken in by the outdoor unit The outside air temperature shall be 43 C or lower Check the allowable dimensions of the air...

Page 160: ...Check the outside air temperature temperature of air taken in by the outdoor unit The outside air temperature shall be 46 C or lower Check the allowable dimensions of the air suction and discharge ar...

Page 161: ...alled at the site Clean Replace the compressor R1443 YES YES YES NO NO NO NO At the heat exchanger and air filter dirty Is the stop valve open Is the connection pipe deformed YES High Check the outdoo...

Page 162: ...red black 2 white black Check the fan capacitor for continuity Does the outdoor fan rotate Does the outdoor unit fan start just after the power is turned on Check the outdoor fan system YES YES NO Nor...

Page 163: ...e zero cross sections circled in Fig 2 5 4 10 Inverter Units Refrigerant System Check Check No 11 Fig 1 Fig 2 Refrigerant system check Check for gas leaks See the section on insufficient gas detection...

Page 164: ...als 5 4 12 Power Transistor Check Check No 13 Checking the power transistor z Never touch any live parts for at least 10 minutes after turning off the circuit breaker z If you cannot avoid to touch a...

Page 165: ...capacitor z Never touch any live parts for at least 10 minutes after turning off the circuit breaker z If unavoidably necessary to touch a live part make sure there is no DC voltage using the tester...

Page 166: ...S70 4 Make a turn of the fan motor with a hand and make sure the pulse 0 15 V appears twice at pins 1 and 4 If the fuse is blown out the outdoor unit fan may also be in trouble Check the fan too If th...

Page 167: ...pins 1 and 4 If the fuse is blown out the outdoor unit fan may also be in trouble Check the fan too If the voltage in Step 2 is not applied it means the PCB is defective Replace the PCB If the pulse...

Page 168: ...the connector connected check the following Output voltage of about 5 V between pins 1 and 3 Generation of 3 pulses between pins 2 and 3 when the fan motor is operating Failure of 1 faulty PCB Replace...

Page 169: ...ghts reserved c Dealer Head Office Umeda Center Bldg 4 12 Nakazaki Nishi 2 chome Kita ku Osaka 530 8323 Japan Tokyo Office JR Shinagawa East Bldg 18 1 Konan 2 chome Minato ku Tokyo 108 0075 Japan http...

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