Model reference

LG PRHR023A

Air Conditioner

2 documents50 error codes11 service modes

Available documentation

Service Manual

Heat Recovery Unit SERVICE MANUAL (Exploded View)26 pg
Covers this model
Air Conditioner Service Manual (R410A)147 pg
Covers this model

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01 on my LG PRHR023A

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Air temperature sensor of indoor unit

From Service Manual 256505, p.37:

1.Access service mode to confirm the active fault code and read stored error history.

2.Disconnect the sensor and measure resistance. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens. A reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part 6322FR2046G

Temperature thermistor

Error codes (50)

CodeMeaning

01Air temperature sensor of indoor unit is open or short.02Inlet pipe temperature sensor of indoor unit is open or short.03Communication error between wired remote controller and indoor unit 04Malfunction of drain pump.05Communication error between outdoor unit and indoor unit 06Outlet pipe temperature sensor of indoor unit is open or short.09Indoor EEPROM error 10Poor fan motor operation 113Outdoor unit liquid pipe (condenser) temperature sensor error 115Outdoor unit subcooling outlet temperature sensor error 150Outdoor unit discharge superheat low 151Failure of operation mode conversion at outdoor unit 2001Pipe detection error (HR unit)201C#HRHR unit liquid pipe temperature sensor error 202C#HRHR unit sub-cooling inlet pipe temperature sensor error 203C#HRHR unit sub-cooling discharge pipe temperature sensor error 204C#HRCommunication error between the HR unit and outdoor unit 205C#HR4 series upgraded 485 communication error between HR unit and HR unit modem.206C#HRDuplicate address error of HR unit 207C#HRCommunication error between Master and Slave Main PCB of HR Unit.208C#HRCommunication error of EEPROM of HR Unit 21Outdoor unit inverter compressor IPM fault 22Inverter board input over current (RMS) of outdoor unit 23Outdoor unit inverter compressor DC link low voltage 24Outdoor unit high pressure switch 25Outdoor unit input voltage high/low 26Outdoor unit inverter compressor start failure 29Outdoor unit inverter compressor over current 32Outdoor unit inverter compressor 1 high discharge temperature.34High pressure of outdoor unit

View all 50 error codes

35Low pressure of outdoor unit 36Outdoor unit low compression ratio limited.40Outdoor unit inverter compressor CT sensor fault 41Outdoor unit inverter compressor discharge temperature sensor fault 42Outdoor unit low pressure sensor fault 43Outdoor unit high pressure sensor fault 44Outdoor unit air temperature sensor fault 45Outdoor unit heat exchanger temperature sensor (front side) fault 46Outdoor unit suction temperature sensor fault 50Omitting connection of R, S, T power of outdoor unit.51Excessive capacity of indoor units 52Communication error: inverter PCB to Main PCB 53Communication error: indoor unit to Main PCB of outdoor unit 57Communication error: Main PCB to inverter PCB 60Inverter PCB EEPROM error of outdoor unit 62Outdoor unit inverter heatsink high temperature 65Outdoor unit inverter heatsink temperature sensor fault 67Outdoor unit fan lock 71Converter CT sensor error of outdoor unit.86Outdoor unit Main PCB EEPROM error

Service modes (11)

Auto Addressing["Wait 3 minutes after supplying power to all master/slave outdoor units and indoor units","Press…
Auto Pipe Detection["After auto addressing is complete, turn on Master unit PCB DIP switch No.5","Select mode using…
Cool & Heat Selector (Heat Pump Only)["Turn on Master unit PCB DIP switch No.5","Select mode using forward/backward buttons to…
Cycle Data View["Turn on Master unit PCB DIP switch No.5","Select mode using forward/backward buttons to…
Heat Pump / Heat Recovery System Setting["Turn on DIP switch No.4","Factory setting display 'HR' appears","Change 'HR' to 'HP' display by…
Night Low Noise Function["Turn on Service PCB DIP switch No.5","Select mode using forward/backward buttons to 'Func'","Push…
Pump Down["Power reset after Master Unit DIP switch setting","Set all IDU to cooling operation","Press the…
Refrigerant Noise Reduction Mode["Turn on Master unit PCB DIP switch No.5","Select mode using forward/backward buttons to…
Snow Removal & Rapid Defrost["Turn on Master unit PCB DIP switch No.5","Select mode using forward/backward buttons to…
Static Pressure Compensation Mode["Turn on Service PCB DIP switch No.5","Select mode using forward/backward buttons to 'Func'","Push…
Vacuum Mode["Turn on Service PCB DIP switch No.5","Select mode using forward/backward buttons to 'SVC'","Push…

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