Model reference

LG LRNU24GVJA0

Air Conditioner

2 documents124 error codes5 service modes

Available documentation

Service Manual

Air Conditioner Service Manual264 pg
Covers this model
Air Conditioner Service Manual R22280 pg
Covers this model

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01 on my LG LRNU24GVJA0

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Air temperature sensor of indoor unit

From Service Manual 991504, p.36:

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 (124)

CodeMeaning

01Air temperature sensor of indoor unit is open or short.02Inlet pipe temperature sensor of indoor unit is open or short.03Transmission error between wired remote controller and indoor unit 04Malfunction of drain pump 05Transmission error between outdoor unit and indoor unit 06Outlet pipe temperature sensor of indoor unit is open or short.07Operation mode between indoor unit and outdoor unit is different.09Indoor unit EEPROM error 10Poor fan motor operation 100System is off due to rising of constant speed compressor 1 discharge…101System is off due to rising of constant speed compressor 2 discharge…102System is off due to rising of constant speed compressor 1 discharge…103System is off due to rising of constant speed compressor 2 discharge…104Transmission error between outdoor units 105Transmission error between outdoor unit Main PCB and fan Main PCB 106Over-current of main outdoor fan motor (inverter fan IPM fault).107Low voltage of main outdoor fan motor driver 108Transmission error from main PCB to fan PCB 109High pressure switch of sub1 outdoor unit is operated by high pressure rising.11Transmission error from indoor unit to main PCB of outdoor 110Reverse connection or omitting connection of R, S, T power of sub1 outdoor unit.111Transmission error 113Liquid pipe temperature sensor of main outdoor unit is open or short.114Subcooling inlet temperature sensor of main outdoor unit is open or short.115Subcooling outlet temperature sensor of main outdoor unit is open or short.116High pressure sensor of sub1 outdoor unit is open or short.117Low pressure sensor of sub1 outdoor unit is open or short.118Air temperature sensor of sub1 outdoor unit is open or short.120Suction temperature sensor of sub1 outdoor unit is open or short.121Discharge temperature sensor of constant speed compressor 1 of sub1 outdoor…

View all 124 error codes

122Discharge temperature sensor of constant speed compressor 2 of sub1 outdoor…123Temperature sensor of front-side heat exchanger of sub1 unit is open or short.124Temperature sensor of rear-side heat exchanger of sub1 unit is open or short.125Liquid pipe temperature sensor of sub1 outdoor unit is open or short.126Subcooling inlet temperature sensor of sub1 outdoor unit is open or short.127Subcooling outlet temperature sensor of sub1 outdoor unit is open or short.128High pressure sensor of sub2 outdoor unit is open or short.129Low pressure sensor of sub2 outdoor unit is open or short.130Air temperature sensor of sub2 outdoor unit is open or short.132Suction temperature sensor of sub2 outdoor unit is open or short.133Discharge temperature sensor of constant speed compressor 1 of sub2 outdoor…134Discharge temperature sensor of constant speed compressor 2 of sub2 outdoor…135Temperature sensor of front-side heat exchanger of sub2 unit is open or short.136Temperature sensor of rear-side heat exchanger of sub2 unit is open or short.137Liquid pipe temperature sensor of sub2 outdoor unit is open or short.138Subcooling inlet temperature sensor of sub2 outdoor unit is open or short.139Subcooling outlet temperature sensor of sub2 outdoor unit is open or short.140High pressure switch of sub2 outdoor unit operated by high pressure rising.141Reverse connection or omitting connection of R, S, T power of sub2 outdoor unit.142Transmission error between outdoor units 143System is off by excessive increase of high pressure of sub1 outdoor unit.144System is off by excessive decrease of low pressure of sub1 outdoor unit.145System is off by excessive increase of high pressure of sub2 outdoor unit.146System is off by excessive decrease of low pressure of sub2 outdoor unit.147Input voltage of sub1 outdoor unit is more than 487V or less than 270V.148Voltage detection circuit of sub1 outdoor unit is out of order.149Input voltage of sub2 outdoor unit is more than 487V or less than 270V.150Voltage detection circuit of sub2 outdoor unit is out of order.151Failure of operation mode conversion 152System is off due to rising of constant speed compressor 1 discharge…153System is off due to rising of constant speed compressor 2 discharge…154High pressure switch of sub3 outdoor unit operated 155Reverse connection or omitting of R, S, T power of sub3 outdoor unit.156Transmission error between outdoor units 157High pressure sensor of sub3 outdoor unit is open or short.158Low pressure sensor of sub3 outdoor unit is open or short.159Air temperature sensor of sub3 outdoor unit is open or short.161Compressor suction temperature sensor of sub3 outdoor unit is open or short.162Discharge temperature sensor of constant speed compressor 1 of sub3 outdoor…163Discharge temperature sensor of constant speed compressor 2 of sub3 outdoor…164Temperature sensor of front-side heat exchanger of sub3 unit is open or short.165Temperature sensor of rear-side heat exchanger of sub3 unit is open or short.166Liquid pipe temperature sensor of sub3 outdoor unit is open or short.167Subcooling inlet temperature sensor of sub3 outdoor unit is open or short.168Subcooling outlet temperature sensor of sub3 outdoor unit is open or short.169System is off by excessive increase of high pressure of sub3 outdoor unit.170System is off by excessive decrease of low pressure of sub3 outdoor unit.171Input voltage of sub3 outdoor unit is more than 487V or less than 270V…172Outdoor voltage sensing error of sub3 173Abnormal starting of main constant compressor 174Abnormal starting of sub1 constant compressor 1 175Abnormal starting of sub1 constant compressor 2 176Abnormal starting of sub2 constant compressor 1 177Abnormal starting of sub2 constant compressor 2 200Pipe detection error 201HR unit 1 liquid pipe temperature sensor error 202HR unit 1 sub-cooling inlet pipe temperature sensor error 203HR unit 1 sub-cooling discharge pipe temperature sensor error 204Transmission error between HR unit 1 and outdoor unit.21IPM fault or overcurrent to inverter compressor.22Overcurrent flows to inverter compressor 23DC voltage charging for driving inverter compressor is not performed after…24System is off by high pressure switch in main outdoor unit.240Central controller connector error (CNU connection failure)241Central controller data transmission error (sending error)242Central controller receive error 243Central controller receive buffer overflow 244Central controller to CNU data transmission failure 245Central controller send timeout 246Central controller receive timeout 25Input voltage is out of tolerable range (low or over voltage).250Central controller check sum error 251Central controller receive zero error 252Central controller wrong address error 32System is off due to rising of inverter compressor discharge temperature in…33System is off due to rising of constant speed compressor discharge temperature…34System is off by excessive increase of high pressure of main outdoor unit (3…35System is off by excessive decrease of low pressure of main outdoor unit (3…40Current sensor of inverter compressor is open or short 41Discharge temperature sensor of inverter compressor is open or short.42Low pressure sensor of main outdoor unit is open or short.43High pressure sensor of main outdoor unit is open or short.44Air temperature sensor of main outdoor unit is open or short.45Temperature sensor of front-side heat exchanger is open or short.46Suction temperature sensor of main outdoor unit is open or short.47Discharge temperature sensor of the constant speed compressor of main outdoor…48Temperature sensor of rear-side heat exchanger is open or short.51Excessive capacity of indoor units 52Transmission error from inverter PCB to main PCB 53Transmission error from indoor unit to main PCB of outdoor unit 54Reverse connection or omitting connection of R, S, T power of main outdoor unit.57Transmission error from main PCB to inverter PCB 62Overheat of inverter heatsink.65Temperature sensor of fan (heatsink) is open or short.

Service modes (5)

auto_addressingPress the address (red) button on Main PCB for 6 seconds
data_display_modeTurn on DIP switch No.7 and No.8, then press and hold the auto-address push switch for 5 seconds.
forced_operationPress the forced operation button (Power button on main unit)
instant_indoor_unit_checkingSet DIP switch (1 ON for cooling, 1 and 2 ON for heating), then push the red button 3 times in 3…
test_operationPress and hold the ON/OFF button (or forced operation button) for 3-5 seconds until the buzzer…

Full entry steps, exit procedures, and test sequences are available in Max.

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