Daikin RX25JVEA9 Service Manual

162 pages

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Si04-115

Inverter Pair

FTK(X)-J / RK(X)-J Series

[Applied Models]

!Inverter Pair : Cooling Only

!Inverter Pair : Heat Pump

Service

Manual

Table of Contents3
Part 1 List of Function3
Part 3 Printed Circuit Board Connector Wiring Diagram3
Part 5 System Configuration3
Part 6 Service Diagnosis3
Introduction6
- Safety Cautions6
Part 1 List of Function10
Functions11
- Indoor Unit and Outdoor Unit11
Part 2 Specification12
Specifications13
- Cooling Only13
- Specifications14
- Heat Pump17
Part 3 Printed Circuit Board Connector Wiring Diagram20
Printed Circuit Board Connector Wiring Diagram and Name21
- FTK25/35J Series, FTX25/35J Series21
- Control Pcb22
- RK25/35J Series, RX25/35J Series24
Part 4 Main Function26
General Functionality27
- Functions of Thermistors27
- Operating Modes29
- Frequency Principle30
- Defrost Control32
- Forced Operation Mode33
- Wide-Angle Flaps, Diffuser, Louveres and Autoswing34
- Fan Speed Control for Indoor Units35
- Fan Speed Control for Outdoor Units36
- General Functions37
- Intelligent Eye39
- Good Sleep Cooling Control41
- Automatic Operation42
- Input Current Control43
- Freeze Protection Function in Cooling44
- Peak-Cut Control Function45
- Four-Way Valve Function Compensation46
- Compressor Protection Function47
- Wet Operation Protection48
- Dew Condensation Sweating Prevention Function49
Part 5 System Configuration50
Instruction51
- Ftk25 / 35J, Ftx25 / 35J51
Part 6 Service Diagnosis70
Caution for Diagnosis71
- Troubleshooting with the Operation Lamp71
Problem Symptoms and Measures72
Service Check Function73
- ARC423 Series73
Code Indication on the Remote Controller74
- Error Codes and Description of Fault74
Trouble Shooting75
- Faulty PCB75
- Operation Shutdown Due to High-Pressure Control or Freeze-Up Protection (Thermistor Activation)76
- Operation Halt Due to Fan Motor (AC Motor) or Related Abnormality77
- Operation Halt Due to Detection of Thermistor or Related Abnormality78
- Faulty Indoor Unit PCB79
- Faulty Indoor Unit PCB80
- Power Supply Abnormalities or Faulty Indoor Printed Circuit Boards81
- Signal Transmission Error (between Indoor and Outdoor Units)82
- Operation Halt Due to Detection of CT Error83
- Operation Halt Due to Thermistor Error or Disconnection Detection84
- Operation Halt Due to Compressor Startup Error85
- Output Overcurrent86
- Troubleshooting87
- Faulty Outdoor Unit PCB88
- Faulty Outdoor Unit PCB and Transmitting/Receiving Circuit89
- Operation Halt Due to Detection of Input over Current90
- Interrupt Due to OL Action92
Check94
- How to Check94
- Power Transistor Check94
  - Capacitor Voltage Check94
  - Thermistor Resistance Check97
- Installation Condition Check98
- Discharge Pressure Check99
- Rectifier Check99
- Power Supply Waveforms Check100
- Hall IC Check101
- Refrigerant System Check101
Part 7 Removal Procedure102
For FTK25J, FTK35J, FTX25J, FTX35J103
- Removal of Air Filter103
- Removal of Front Grille106
- Removal of Horizontal Blade and Vertical Blade109
- Removal of Switch Box, PC Board and Swing Motor111
- Removal of Heat Exchanger117
- Install of Drain Plug120
- Removal of Fan Rotor and Motor121
- Si04124
For RK25J, RK35J, RX25J, RX35J125
- Removal of External Casing125
- Removal of Bell Mouth and Left Side Plate128
- Removal of PC Board and Switch Box129
- Removal of Propeller Fan and Fan Motor135
- Removal of Compressor Noise Absorption Pad137
- Removal of Partition Plate and Reactor139
- Removal of Four-Way Valve141
- Removal of Compressor143
Part 8 Others147
Others147
- Explanation147
Part 9 Appendix150
Piping Diagram151
- Indoor Unit151
- Outdoor Unit152
Wiring Diagram154
- Indoor Unit154
- Outdoor Unit156
Index158

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Questions and Answers:

J
Jonathan NunezAug 5, 2025
What to do if my Daikin RX25JVEA9 Air Conditioner stops suddenly and the operation lamp blinks?
- P
  Paul WestAug 6, 2025
  If your Daikin Air Conditioner stops suddenly and the OPERATION lamp is blinking, clean the air filters or remove any obstructions. Then, turn the breaker OFF, and turn it back ON. Try operating the air conditioner with the remote controller after that.