Model reference
LG LRNU12GSEA0
Air Conditioner
3 documents92 error codes9 service modes
Available documentation
Service Manual
- Air Conditioner Service Manual R22279 pg
- Air Conditioner Service Manual279 pg
- Air Conditioner Service Manual R22280 pg
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Error codes (92)
CodeMeaning
01Indoor unit room temperature sensor is open or short.02Indoor unit inlet pipe temperature sensor is open or short.03Transmission error between wired remote controller and indoor unit04Malfunction of drain pump.05Transmission error between outdoor unit and indoor unit06Indoor unit outlet pipe temperature sensor is open or short.07Operation mode between indoor unit and outdoor unit is different.09Serial number marked on EEPROM of indoor unit is 0 or FFFFFF.10Poor fan motor operation100System off due to excessive increase of discharge temperature of constant speed…101System off due to excessive increase of discharge temperature of constant speed…102System off due to excessive increase of discharge temperature of constant speed…103System off due to excessive increase of discharge temperature of constant speed…104Transmission error from sub1 outdoor unit to main outdoor unit105Transmission error from fan PCB to main PCB106Over-current of fan motor (fan IPM fault).107Low voltage of fan motor driver.108Transmission error from main PCB to fan PCB109High pressure switch of sub1 outdoor unit operated by high pressure rising.11Transmission error from indoor unit to main PCB of outdoor unit110Reverse connection or omitting connection of R, S, T power of sub1 outdoor unit.111Transmission error from main outdoor unit to sub1 outdoor unit113Liquid 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 92 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 from main outdoor unit to sub2 outdoor unit143System off by excessive increase of high pressure of sub1 outdoor unit.144System off by excessive decrease of low pressure of sub1 outdoor unit.145System off by excessive increase of high pressure of sub2 outdoor unit.146System 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 conversion173Failure of main constant speed compressor operation174Failure of sub1 constant speed compressor 1 operation175Failure of sub1 constant speed compressor 2 operation176Failure of sub2 constant speed compressor 1 operation177Failure of sub2 constant speed compressor 2 operation178Failure of sub3 constant speed compressor 1 operation179Failure of sub3 constant speed compressor 2 operation21DC peak22Overcurrent of inverter compressor23Poor voltage charge for driving inverter compressor24High pressure switch of main outdoor unit25Low/over voltage32System off due to rising of inverter compressor discharge temperature.33System off due to rising of constant speed compressor discharge temperature.34System off by excessive increase of high pressure of main outdoor unit (high…35System off by excessive decrease of low pressure of main outdoor unit (low…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 constant speed compressor of main outdoor unit…48Temperature sensor of rear-side heat exchanger is open or short.49Voltage detection circuit of main outdoor unit is out of order.51Excessive connection of indoor units compared to capacity of outdoor unit.52Transmission error from inverter PCB to main PCB53Transmission error from indoor unit to main PCB of outdoor unit54Reverse connection or omitting connection of R, S, T power of main outdoor unit.57Transmission error from main PCB to inverter PCB62Overheat of inverter heatsink65Temperature sensor of fan (heat sink) is open or short.
Service modes (9)
- 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 on the main unit of the appliance.
- forced_operation_cooling_onlyPress the forced operation button on the indoor unit main body.
- forced_operation_heat_pumpPress the forced operation button on the indoor unit main body.
- instant_indoor_unit_checkingSet DIP switch #1 ON for cooling (or #1 and #2 ON for heating), then push the red (address) button…
- instant_indoor_unit_checking_coolingSet main outdoor DIP switch #1 ON (cooling mode)
- instant_indoor_unit_checking_heatingSet main outdoor DIP switch #1 and #2 ON (heating mode)
- 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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