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Daikin FTX20K2V1B, Service Manual

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Daikin FTX20K2V1B Service Manual Download Page 68

Troubleshooting

SiBE041525F

57

Service Diagnosis

4.7

Signal Transmission Error (Between Indoor Unit and 
Outdoor Unit)

Error Code

U4

Method of Error 
Detection

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

Error Decision 
Conditions

The data sent from the outdoor unit cannot be received normally, or the content of the data is 
abnormal.

Supposed 
Causes

Power supply voltage is not as specified.

Reduction of power supply voltage

Wiring error

Breaking of the connecting wires between the indoor and outdoor units (wire No. 3)

Defective outdoor unit PCB

Short circuit inside the fan motor winding

Defective indoor unit PCB

Disturbed power supply waveform

Summary of Contents for FTX20K2V1B

Page 1: ...Service Manual Applicable Models Inverter Pair Heat Pump Inverter Pair Wall Mounted Type FTX ATX K Series SiBE041525F...

Page 2: ...K Series Heat Pump Indoor Unit FTX20K 2 V1B FTX50K M 2 V1B ATX20K 2 V1B FTX25K 2 V1B FTX60K M 2 V1B ATX25K 2 V1B FTX35K 2 V1B FTX71K M 2 V1B ATX35K 2 V1B Outdoor Unit RX20K2 5V1B RX50K 2 V1B ARX20K2V1...

Page 3: ...SiBE041525F Table of Contents ii Version log Month Year Version Revised contents 01 2016 SiBE041525E A RX20 35K2 02 2016 SiBE041525F Include RX71K FTX71KM standard S21 connection...

Page 4: ...Frequency Principle 15 1 3 Airflow Direction Control 17 1 4 Fan Speed Control for Indoor Unit 18 1 5 Program Dry Operation 19 1 6 Automatic Operation 20 1 7 Thermostat Control 21 1 8 NIGHT SET Mode 2...

Page 5: ...verload 61 4 11 Compressor Lock 63 4 12 DC Fan Lock 64 4 13 Input Overcurrent Detection 65 4 14 Four Way Valve Abnormality 66 4 15 Discharge Pipe Temperature Control 68 4 16 High Pressure Control in C...

Page 6: ...ed Cooling Operation 91 2 Trial Operation 92 3 Field Settings 93 3 1 Temperature Display Switch 93 3 2 When 2 Units are installed in 1 Room 93 4 Silicone Grease on Power Transistor Diode Bridge 94 Par...

Page 7: ...rding Safety of Workers Warning Do not store equipment in a room with fire sources e g naked flames gas appliances electric heaters Be sure to disconnect the power cable from the socket before disasse...

Page 8: ...the refrigerant system If air enters the refrigerant system an excessively high pressure results causing equipment damage and injury Warning Caution Do not repair electrical components with wet hands...

Page 9: ...ve heat generation or fire Be sure to use an exclusive power circuit for the equipment and follow the local technical standards related to the electrical equipment the internal wiring regulations and...

Page 10: ...t conducted securely the equipment may fall and cause injury Check to make sure that the power cable plug is not dirty or loose then insert the plug into a power outlet securely If the plug is dusty o...

Page 11: ...m and wet the furniture and floor Do not tilt the unit when removing it The water inside the unit may spill and wet the furniture and floor Caution Icon Type of Information Description Warning Warning...

Page 12: ...SiBE041525F 1 List of Functions Part 1 List of Functions 1 Functions 2...

Page 13: ...ty Durability Auto restart after power failure 3 D airflow Self diagnosis R C LED COMFORT AIRFLOW operation Wiring error check function Comfort Control Auto fan speed Anti corrosion treatment of outdo...

Page 14: ...D airflow Self diagnosis R C LED COMFORT AIRFLOW operation Wiring error check function Comfort Control Auto fan speed Anti corrosion treatment of outdoor heat exchanger Indoor unit quiet operation Fle...

Page 15: ...SiBE041525F Specifications 4 Part 2 Specifications 1 Specifications 5...

Page 16: ...Specifications SiBE041525F 5 Specifications 1 Specifications See corresponding databook...

Page 17: ...ed Circuit Board Connector Wiring Diagram 6 Part 3 Printed Circuit Board Connector Wiring Diagram 1 Indoor Unit 7 1 1 20 25 35 Class 7 1 2 50 60 71 Class 9 2 Outdoor Unit 12 2 1 20 25 35 Class 12 2 2...

Page 18: ...ntrol PCB PCB1 1 S6 Connector for swing motor horizontal blade 2 S26 Connector for display PCB 3 S32 Connector for indoor heat exchanger thermistor 4 S200 Connector for DC fan motor 5 H1 H2 H3 FG Conn...

Page 19: ...BR069 1 S27 Connector for control PCB 2 SW1 S1W Forced cooling operation ON OFF button Refer to page 91 for details 3 LED1 H1P LED for operation green 4 LED2 H2P LED for timer yellow 5 RTH1 R1T Room t...

Page 20: ...am 1 2 50 60 71 Class Control PCB PCB2 1 S6 Connector for swing motor horizontal blade 2 S26 Connector for display PCB 3 S32 Connector for indoor heat exchanger thermistor 4 S200 Connector for DC fan...

Page 21: ...board 2 S800 Connector for control PCB 3 FG HE Connector for ground 4 FU1 Fuse 3 15 A 250 V 5 V2 Varistor 3P380932 1 FG S800 V2 HE S100 FU1 1 S27 Connector for control PCB 2 SW1 S1W Forced cooling ope...

Page 22: ...door Unit SiBE041525F 11 Printed Circuit Board Connector Wiring Diagram Remote Control PCB BR069 S602 S21 To connector S403 of control PCB PCB1 S601 To optional wired remote controller BRC073 and BRP0...

Page 23: ...nector for DC fan motor 5 S80 Connector for four way valve coil 6 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 7 E1 E2 Terminal for earth wire 8 HL1 HN1 S Co...

Page 24: ...nector for four way valve coil heat pump model only 5 S90 Connector for thermistors outdoor temperature outdoor heat exchanger discharge pipe 6 HL1 HN1 S Connector for terminal board 7 E1 E2 Terminal...

Page 25: ...ECONO Operation 22 1 10 Inverter POWERFUL Operation 23 1 11 Other Functions 24 2 Thermistor Functions 25 3 Control Specification 26 3 1 Mode Hierarchy 26 3 2 Frequency Control 27 3 3 Controls at Mode...

Page 26: ...controlled by the following 2 parameters The load condition of the operating indoor unit The difference between the room thermistor temperature and the target temperature The target frequency is adap...

Page 27: ...nce the set temperature is reached the energy saving operation enables to maintain the room temperature at low power Frequency Limits The following functions regulate the minimum and maximum frequency...

Page 28: ...airflow downward to spread the warm air to the entire room Wide Angle Louvers The louvers made of elastic synthetic resin provide a wide range of airflow that guarantees comfortable air distribution...

Page 29: ...setting button is set to automatic Cooling The following drawing explains the principle of fan speed control for cooling The upper limit is M tap in 30 minutes from the operation start Heating In heat...

Page 30: ...the target temperature is divided into two zones Then the unit operates in an appropriate capacity for each zone to maintain the temperature and humidity at a comfortable level Thermostat turns on als...

Page 31: ...set temperature Ts determines the target temperature Tt Ts 18 30 C 2 The target temperature Tt is calculated as Tt Ts C where C is the correction value C 0 C 3 Thermostat ON OFF point and operation mo...

Page 32: ...he system resumes from defrost control in any zones except A The operation turns on in any zones except A The monitoring time has passed while the temperature difference is in the zone B Cooling 10 mi...

Page 33: ...ty does not allow the use of multiple electrical devices and air conditioners It can be easily activated by pushing the ECONO button on the wireless remote controller Detail When this function is acti...

Page 34: ...pm Ex POWERFUL operation in cooling Note POWERFUL operation cannot be used together with ECONO or COMFORT AIRFLOW operation Operation mode Fan speed Target temperature COOL H tap A rpm 18 C DRY Dry ro...

Page 35: ...ay of the unit Press the ON OFF button once to start operation Press once again to stop it The ON OFF button is useful when the remote controller is missing or the battery has run out Forced cooling o...

Page 36: ...re used in place of the inner temperature of the compressor rises abnormally the operating frequency becomes lower or the operation halts 2 The discharge pipe thermistor is used for detecting disconne...

Page 37: ...de for installation and servicing Detail Note Unless specified otherwise a dry operation command is regarded as cooling operation Air conditioner control mode Forced operation mode Forced cooling oper...

Page 38: ...eak cut freeze up protection defrost 3 Determine lower limit frequency The maximum value is set as a lower limit frequency among the frequency lower limits of the following functions Four way valve op...

Page 39: ...justed according to the D value When the D value is low the frequency is lowered When the D value is high the frequency is increased 3 Frequency control when other controls are functioning When freque...

Page 40: ...iation fin temperature 85 C OFF condition Discharge pipe temperature 2 C Radiation fin temperature 90 C Control B ON condition Discharge pipe temperature 10 C Radiation fin temperature 85 C OFF condit...

Page 41: ...way valve switching The lower limit of frequency keeps A Hz for B seconds with any conditions 1 through 4 above When the outdoor temperature is above C C in heating the frequency decreases depending...

Page 42: ...mperature from rising further Detail 20 25 35 class 50 60 71 class A C 110 110 B C 103 103 C C 98 101 5 D C 93 100 E C 88 95 Zone Control Stop zone When the temperature reaches the stop zone the compr...

Page 43: ...one The upper limit of the compressor frequency is defined as operation frequency 2 Hz After this the output frequency is lowered by 2 Hz every second until it reaches the keep zone Keep zone The pres...

Page 44: ...gh pressure The operating frequency limitation is judged with the indoor heat exchanger temperature A C B C C C 7 5 3 R22433 Reset zone Indoor heat exchanger thermistor temperature Up zone Keep zone D...

Page 45: ...s normal operation 5 Fan speed control during forced cooling operation The outdoor fan is controlled as well as normal operation during forced cooling operation 6 Fan speed control during POWERFUL ope...

Page 46: ...start of the operation or ending the previous defrosting Conditions for Canceling Defrost The judgment is made with the outdoor heat exchanger temperature B C The same value continues 20 25 class 35...

Page 47: ...discharge pipe thermistor is disconnected Feedback Control Target discharge pipe temperature control Detail The followings are the examples of electronic expansion valve control which function in each...

Page 48: ...Operation Control The electronic expansion valve opening is controlled when the operation starts thus preventing superheating or liquid compression 3 11 5 Control when the Frequency Changes When the...

Page 49: ...ained Discharge pipe temperature 6 C outdoor heat exchanger temperature 2 When the operation mode is heating When the following condition is fulfilled the discharge pipe thermistor disconnection is as...

Page 50: ...ure thermistor 3 12 2 Detection of Overcurrent and Overload Outline An excessive output current is detected and the OL temperature is observed to protect the compressor Detail If the OL compressor hea...

Page 51: ...SiBE041525F Remote Controller 40 Part 5 Remote Controller 1 Remote Controller 41...

Page 52: ...ach section is shown with all its displays on for the purpose of explanation R22988 Signal transmitter To use the remote controller aim the transmitter at the indoor unit If there is anything blocking...

Page 53: ...button Starts COMFORT AIRFLOW operation ON TIMER button Adjusts the ON TIMER setting The timer can be set 1 12 hours In indoor unit quiet operation operation sound becomes weak The airflow rate also...

Page 54: ...Lock 63 4 12 DC Fan Lock 64 4 13 Input Overcurrent Detection 65 4 14 Four Way Valve Abnormality 66 4 15 Discharge Pipe Temperature Control 68 4 16 High Pressure Control in Cooling 69 4 17 Compressor S...

Page 55: ...lamp OFF Check the outdoor temperature Heating operation is not available when the outdoor temperature is 18 CWB or higher and cooling operation is not available when the outdoor temperature is below...

Page 56: ...nctions 2 When a signal transmission error occurs between the indoor and outdoor units In either case conduct the diagnostic procedure described in the following pages 2 2 Outdoor Unit The outdoor uni...

Page 57: ...To return to the normal mode hold the TIMER CANCEL button down for 5 seconds When the remote controller is left untouched for 60 seconds it also returns to the normal mode 3 Not all the error codes a...

Page 58: ...5C is displayed on the LCD 2 Select 5C service check with the TEMP or TEMP button 3 Press the FAN button to enter the service check mode 00 is displayed and the left side number blinks 4 Press the TE...

Page 59: ...or TEMP button and change the number until you hear the long beep 8 Diagnose by the sound beep The left side number does not correspond with the error code two consecutive beeps The left side number...

Page 60: ...related abnormality 54 C9 Room temperature thermistor or related abnormality 54 Outdoor Unit E1 Outdoor unit PCB abnormality 60 E5 OL activation compressor overload 61 E6 Compressor lock 63 E7 DC fan...

Page 61: ...ly voltage Start operation Voltage as rated Error repeats Check the power supply voltage Start operation Voltage as rated Error repeats Error repeats Combination of the indoor and outdoor unit matched...

Page 62: ...rol During heating operation the indoor heat exchanger temperature is above about 60 C Supposed Causes Short circuited air Clogged air filter of the indoor unit Dust accumulation on the indoor heat ex...

Page 63: ...or operation Error Decision Conditions The detected rotation speed does not reach the demanded rotation speed of the target tap and is less than 50 of the maximum fan motor rotation speed Supposed Cau...

Page 64: ...the fan Is the rotation pulse generated Rotate the fan by hand Turn the power on again Check the fan motor for breakdown or short circuit Check the motor control voltage Check the indoor unit PCB for...

Page 65: ...posed Causes Disconnection of connector Thermistor corresponding to the error code is defective Defective indoor unit PCB Troubleshooting Check No 01 Refer to P 79 C4 Indoor heat exchanger thermistor...

Page 66: ...the model The compressor stops if the error occurs and restarts automatically after 3 minute standby Over voltage detection An over voltage signal is fed from the over voltage detection circuit to th...

Page 67: ...YES YES Reconnect the harness Check the power supply voltage Check the connection of the compressor harness Disturbance factors Noise Power supply distortion Precaution before turning on the power ag...

Page 68: ...rmal Error Decision Conditions The data sent from the outdoor unit cannot be received normally or the content of the data is abnormal Supposed Causes Power supply voltage is not as specified Reduction...

Page 69: ...oor unit Is LED A blinking Properly insulated Is there any disturbance Is there any wiring error Check the indoor unit outdoor unit connection wires Check the LED A on the outdoor unit PCB Be sure to...

Page 70: ...connected Wrong wiring of connecting wires Wrong indoor unit PCB or outdoor unit PCB mounted Defective indoor unit PCB Defective outdoor unit PCB Troubleshooting R20435 Caution NO YES YES NO Match the...

Page 71: ...the power switch before connecting or disconnecting connectors or parts may be damaged Continuously ON or OFF Blink Check the voltage of the connection wires on the indoor terminal board between No 1...

Page 72: ...wn Reset condition Continuous run for about 60 minutes without any other error Supposed Causes Disconnection of discharge pipe thermistor Defective discharge pipe thermistor Disconnection of connector...

Page 73: ...ctronic expansion valve or the coil Refer to the refrigerant line check procedure Replace the outdoor unit PCB main PCB Replace the four way valve or the coil Replace the outdoor unit PCB main PCB Dis...

Page 74: ...he harnesses U V and W R21067 Caution NO YES YES NO NO YES NO YES Check No 15 Check with the inverter analyzer Turn off the power and reconnect the harnesses Turn on the power again and restart the sy...

Page 75: ...ck in the fan Defective fan motor Defective outdoor unit PCB Troubleshooting Check No 16 Refer to P 85 FU2 R21669 Caution YES YES NO YES NO NO YES NO NO Turn on the power Rotate the fan YES Check No 1...

Page 76: ...No 18 Refer to P 86 Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged An input overcurrent may result from wrong internal wiring If the...

Page 77: ...owing condition continues over 10 minute after operating for 5 minutes Cooling Dry A B 5 C Heating B A 5 C A Room thermistor temperature B Indoor heat exchanger temperature If the error repeats the sy...

Page 78: ...st clogged Reconnect the thermistor s Caution Be sure to turn off the power switch before connecting or disconnecting connectors or parts may be damaged R20405 Refrigerant shortage Water mixed Stop va...

Page 79: ...ectronic expansion valve or coil Refrigerant shortage Defective four way valve Water mixed in refrigerant Defective stop valve Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 79 Chec...

Page 80: ...stor Defective outdoor unit PCB Troubleshooting Check No 01 Refer to P 79 Check No 12 Refer to P 81 Check No 17 Refer to P 86 Check No 18 Refer to P 86 Check No 19 Refer to P 87 R20418 Caution Replace...

Page 81: ...tage before compressor start up is below 50 V Supposed Causes Broken or disconnected harness Defective outdoor unit PCB Troubleshooting Caution Be sure to turn off the power switch before connecting o...

Page 82: ...the position detection circuit Error Decision Conditions If the error repeats the system is shut down Reset condition Continuous run for about 11 minutes without any other error Supposed Causes Power...

Page 83: ...heck with the inverter analyzer Turn off the power Disconnect the harnesses U V and W Turn on the power Check the electrolytic capacitor voltage Electrical components or compressor harnesses connected...

Page 84: ...ower on J3 error is judged if the discharge pipe temperature is lower than the heat exchanger temperature Supposed Causes Disconnection of the connector for the thermistor Thermistor corresponding to...

Page 85: ...r s of the following thermistors Outdoor temperature thermistor Discharge pipe thermistor Outdoor heat exchanger thermistor Cooling Outdoor heat exchanger temperature Heating Indoor heat exchanger tem...

Page 86: ...r unit PCB Troubleshooting Check No 17 Refer to P 86 Check No 19 Refer to P 87 A C B C C C 20 25 35 class 93 70 78 50 60 71 class 90 64 81 Caution WARNING To cool the electrical components the outdoor...

Page 87: ...er replacing the outdoor unit PCB Troubleshooting Check No 17 Refer to P 86 Check No 19 Refer to P 87 Note Refer to Silicone Grease on Power Transistor Diode Bridge on page 94 for details A C B C 20 2...

Page 88: ...rotation speed error occurs while the compressor is running An output overcurrent signal is fed from the output overcurrent detection circuit to the microcomputer If the error repeats the system is sh...

Page 89: ...he power supply voltage Monitor the power supply voltage discharge and suction pressures and other factors for a long term Possible causes Momentary drop of power supply voltage Compressor overload Sh...

Page 90: ...PCB remove the thermistor and measure the resistance The data is for reference purpose only Thermistor temperature C Resistance k Room temperature thermistor Other thermistors 20 73 4 197 8 15 57 0 14...

Page 91: ...oltage check 1 Check the connector for connection 2 Check the motor control voltage is generated between the pins 2 3 Rotation pulse check 1 Check the connector for connection 2 Turn the power on and...

Page 92: ...is correctly connected to the PCB 2 Turn the power off and on again and check if the EV generates a latching sound 3 If the EV does not generate a latching sound in the above step 2 disconnect the con...

Page 93: ...oil Cooling Dry Not energized Heating Energized Replace the outdoor unit PCB main PCB Replace the four way valve coil Replace the four way valve Four way valve coil resistance at 1000 2000 S80 voltage...

Page 94: ...e to turn the power off Step 2 Install an inverter analyzer instead of a compressor Note Make sure the charged voltage of the built in smoothing electrolytic capacitor drops to 10 VDC or below before...

Page 95: ...ck the power module Refer to Check No 22 3 If NG in Check No 22 replace the power module Replace the main PCB The power module is united with the main PCB If OK in Check No 22 check if there is any so...

Page 96: ...2 4 is 0 6 5 VDC 5 Keep operation off and power off Connect the connector S70 or S71 6 Check whether 4 rotation pulses 0 15 VDC are input at the pins 1 4 when the fan motor is rotated 1 turn by hand...

Page 97: ...dirty Change the installation location or direction Change the installation location or direction Clean the outdoor heat exchanger Check the outdoor temperature The outdoor temperature should be withi...

Page 98: ...the table below If the resistance is or less than 1 k short circuit occurs on the main circuit 20 25 35 class R21195 YES NO NO YES Outdoor fan system is functioning Check the outdoor fan system Recon...

Page 99: ...press the protrusion on the connector Follow the procedure below to measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter Evaluate the mea...

Page 100: ...Check SiBE041525F 89 Service Diagnosis 20 25 35 class 50 60 71 class Pin 24 Pin 23 U Pin 22 V Pin 21 W Pin 20 R20703 R20704 W V U DC_P1 DC_N1...

Page 101: ...nd Field Settings 1 Tips for Servicing 91 1 1 Pump Down Operation 91 1 2 Forced Cooling Operation 91 2 Trial Operation 92 3 Field Settings 93 3 1 Temperature Display Switch 93 3 2 When 2 Units are ins...

Page 102: ...quid stop valve Service port R13628 Hexagonal wrench Item Forced Cooling Conditions The forced cooling operation is allowed when both of the following conditions are met 1 The outdoor unit is not abno...

Page 103: ...rature 30 C Trial operation may be disabled in either operation mode depending on the room temperature After trial operation is complete set the temperature to a normal level 26 C 28 C in cooling 20 C...

Page 104: ...the corresponding wireless remote controller can be set for different addresses Procedure 1 Remove the battery cover of the remote controller and cut the address jumper 2 Press the center of the TEMP...

Page 105: ...ridge Detail 1 Wipe off the old silicone grease completely 2 Apply the silicone grease evenly See the illustrations below for examples of application 3 Tighten the screws of the power transistor diode...

Page 106: ...SiBE041525F 95 Appendix Part 8 Appendix 1 Piping Diagrams 96 1 1 Indoor Unit 96 1 2 Outdoor Unit 97 2 Wiring Diagrams 99 2 1 Indoor Unit 99 2 2 Outdoor Unit 101...

Page 107: ...xchanger Crossflow fan Thermistor heat exchanger Fan motor Refrigerant flow Cooling Heating Field piping 6 4 CuT Field piping 9 5 CuT 9 5 CuT 6 4 CuT 4D0094181 6 4 CuT Indoor unit 12 7 CuT Heat exchan...

Page 108: ...thermistor Compressor Accumulator Muffler Gas stop valve Liquid stop valve Field piping 6 4 CuT Field piping 9 5 CuT 4 way valve ON heating 3D090673B Outdoor unit Field piping 6 4 CuT Field piping 9...

Page 109: ...eld piping 6 4 CuT Field piping 12 7 CuT 12 7 CuT 4 way valve ON heating Outdoor temperature Thermistor 3D094281 12 7 CuT 7 9 CuT Cooling Heating 7 0 CuT Capillary tube 1 4 0 CuT Capillary tube 2 4 0...

Page 110: ...Wiring Diagrams 2 1 Indoor Unit FTX20 25 35K 2 V1B ATX20 25 35K 2 V1B Note PCB1 Control PCB PCB2 Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram PCB3 Remote Control PCB...

Page 111: ...Appendix 100 FTX50 60 71K M 2 V1B Note PCB A1P Filter PCB PCB A2P Control PCB PCB A3P Display PCB Refer to Part 3 for Printed Circuit Board Connector Wiring Diagram PCB A4P Remote Control PCB BR069 o...

Page 112: ...WHT YLW ORG BLU BLU BLU BLK BLK BLK BLK BLK BLK BLK BLK RED WHT RED BRN ORG BLU Outdoor Discharge Condenser R1T R2T R3T Z1C N 2 t t t DB1 X1M PCB1 M1C Q1L IPM1 SA1 Y1R Y1E Diode bridge Terminal strip...

Page 113: ...MS 3 IN CASE OF HEAT PUMP TYPE R1T OUTDOOR R3T DISCHARGE R2T CONDENSER NOTE 1 REFER TO THE NAMEPLATE FOR THE POWER REQUIREMENTS C7 DB1 FU1 FU2 FU3 IPM1 L N M1C MS 3 M1F MS MRM10 MRM20 MR30 MRCW PAM ZF...

Page 114: ...s supplied or specified by Daikin Ask a qualified installer or contractor to install those parts and accessories Use of unauthorised parts and accessories or improper installation of parts and accesso...

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