Daikin RXG50K2V1B User Manual

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Service

Manual

[Applied Models]

z Inverter Pair : Heat Pump

Inverter Pair

Wall Mounted Type J-Series

SiBE041012_A

Table of Contents

Table of Contents3
Introduction7
- Safety Cautions7
- Used Icons11
Part 1 List of Functions12
Functions13
Part 2 Specifications15
Specifications16
Part 3 Printed Circuit Board Connector Wiring Diagram21
Indoor Unit22
Outdoor Unit25
- Rxg25/35J2V1B, Rxg25/35K2V1B25
- Rxg50K2V1B27
Part 4 Function and Control29
Main Functions30
- Temperature Control30
- Frequency Principle30
- Operation Starting Control32
- Airflow Direction Control33
- Fan Speed Control for Indoor Unit34
- Program Dry Operation35
- Automatic Operation36
- Thermostat Control37
- NIGHT SET Mode38
- ECONO Operation39
- INTELLIGENT EYE Operation40
- Inverter POWERFUL Operation41
- Other Functions43
Function of Thermistor44
Control Specification45
- Mode Hierarchy45
- Frequency Control46
- Controls at Mode Changing / Start-Up48
- Compressor Protection Function49
- Discharge Pipe Temperature Control50
- Input Current Control51
- Freeze-Up Protection Control52
- Heating Peak-Cut Control52
- Outdoor Fan Control53
- Liquid Compression Protection Function53
- Defrost Control54
- Outdoor Electronic Expansion Valve Control55
- Pressure Equalizing Control56
- Malfunctions58
Part 5 Operation Manual59
System Configuration60
Operation Manual61
- Name of Parts61
- Remote Controller63
- AUTO · DRY · COOL · HEAT · FAN Operation65
- Operating Conditions66
- Adjusting the Airflow Direction and Rate67
- COMFORT AIRFLOW Operation69
- INTELLIGENT EYE Operation70
- POWERFUL Operation72
- OUTDOOR UNIT QUIET Operation73
- ECONO Operation74
- During Operation74
- OFF TIMER Operation75
- ON TIMER Operation76
- WEEKLY TIMER Operation77
Part 6 Service Diagnosis83
Troubleshooting with LED85
- Indoor Unit85
- Outdoor Unit85
Problem Symptoms and Measures86
Service Check Function87
Troubleshooting90
- Error Codes and Description90
- Indoor Unit PCB Abnormality91
- Freeze-Up Protection Control or Heating Peak-Cut Control93
- Fan Motor (DC Motor) or Related Abnormality95
- Thermistor or Related Abnormality (Indoor Unit)97
- Front Panel Open / Close Fault98
- Signal Transmission Error (between Indoor Unit and Outdoor Unit)99
- Unspecified Voltage (between Indoor Unit and Outdoor Unit)101
- Outdoor Unit PCB Abnormality102
- OL Activation (Compressor Overload)104
- Compressor Lock105
- DC Fan Lock106
- Input Overcurrent Detection107
- Four Way Valve Abnormality108
- Discharge Pipe Temperature Control110
- High Pressure Control in Cooling111
- Compressor System Sensor Abnormality112
- Position Sensor Abnormality114
- DC Voltage / Current Sensor Abnormality (25/35 Class)117
- CT or Related Abnormality (50 Class)118
- Thermistor or Related Abnormality (Outdoor Unit)120
- Electrical Box Temperature Rise122
- Radiation Fin Temperature Rise124
- Output Overcurrent Detection126
- Refrigerant Shortage128
- Low-Voltage Detection or Over-Voltage Detection131
- Signal Transmission Error on Outdoor Unit PCB (50 Class Only)133
Check134
- Thermistor Resistance Check134
- Fan Motor Connector Check135
- Power Supply Waveforms Check135
- Electronic Expansion Valve Coil Check136
- Four Way Valve Performance Check137
- Inverter Unit Refrigerant System Check137
- Inverter Checker" Check138
- Rotation Pulse Check on the Outdoor Unit PCB140
- Installation Condition Check141
- Discharge Pressure Check141
- Outdoor Fan System Check142
- Main Circuit Short Check142
- Capacitor Voltage Check143
- Power Module Check143
Part 7 Removal Procedure144
Indoor Unit145
- Removal of Air Filters / Front Panel145
- Removal of Horizontal Blades149
- Removal of Front Grille151
- Removal of Front Panel Mechanism ASSY154
- Removal of Display Lens ASSY156
- Removal of Reduction Motor / Limit Switch157
- Removal of Fan Guards / Electrical Box159
- Removal of Pcbs162
- Removal of Swing Motors168
- Removal of Indoor Heat Exchanger169
- Removal of Fan Rotor / Fan Motor172
- Removal of Vertical Blade Assys175
Outdoor Unit - 25/35 Class176
- Removal of Outer Panels / Fan Motor176
- Removal of Electrical Box185
- Removal of Pcbs188
- Removal of Reactor / Partition Plate196
- Removal of Sound Blankets198
- Removal of Four Way Valve200
- Removal of Compressor203
Outdoor Unit - 50 Class205
- Removal of Outer Panels205
- Removal of Outdoor Fan / Fan Motor209
- Removal of Electrical Box213
- Removal of Pcbs218
- Removal of Sound Blankets / Thermistors221
- Removal of Four Way Valve223
- Removal of Electronic Expansion Valve224
- Removal of Compressor225
Part 8 Trial Operation and Field Settings228
Pump down Operation229
Forced Cooling Operation230
Trial Operation232
Field Settings233
- When 2 Units Are Installed in 1 Room233
- Standby Electricity Saving234
- Jumper and Switch Settings234
Application of Silicon Grease to a Power Transistor and a Diode Bridge235
Part 9 Appendix236
Piping Diagrams237
- Indoor Unit237
- Outdoor Unit237
Wiring Diagrams239
- Indoor Unit239
- Outdoor Unit239

Questions and Answers:

L
Linda OrozcoAug 5, 2025
What to do if the multi-colored indicator lamp blinks on my Daikin Air Conditioner?
- M
  Michelle BlackAug 5, 2025
  If the multi-colored indicator lamp on your Daikin Air Conditioner is blinking, it could be due to a protection device being activated in either the indoor or outdoor unit, or a thermistor malfunction. It could also indicate a signal transmission error between the indoor and outdoor units. In both cases, you should conduct the diagnostic procedure described in the following pages.

Daikin RXG50K2V1B Specifications

General

Category	Air Conditioner
Model	RXG50K2V1B
Type	Split System
Cooling Capacity	5.0 kW
Heating Capacity	5.8 kW
Seasonal Energy Efficiency Ratio (SEER)	6.1
Power Supply	220-240 V, 50 Hz
Outdoor Unit Noise Level	48 dB(A)
Refrigerant	R32
Indoor Unit Noise Level	32 dB(A)

Summary

Introduction

Safety Cautions

Crucial safety warnings and precautions for handling the equipment during repair and operation.

Part 2 Specifications

Specifications

Part 3 Printed Circuit Board Connector Wiring Diagram

Indoor Unit PCBs

Outdoor Unit PCBs

Part 4 Function and Control

Part 6 Service Diagnosis

Troubleshooting with LED

Provides guidance on diagnosing issues based on LED indicators.

Problem Symptoms and Measures

Lists common operational problems and their corresponding solutions or checks.

Service Check Function

Explains how to use the service check function via the remote controller.

Troubleshooting

Comprehensive guide to diagnosing and resolving system malfunctions and error codes.

Check

Lists various diagnostic checks for system components like thermistors, motors, and power supply.

Part 7 Removal Procedure

Indoor Unit Component Removal

Outdoor Unit - 25/35 Class Component Removal

Outdoor Unit - 50 Class Component Removal

Part 8 Trial Operation and Field Settings

Trial Operation

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