Model reference
LG LRNUSERIES
Air Conditioner
10 documents145 error codes25 service modes
Available documentation
Service Manual
- Air Conditioner Service Manual R22312 pg
- Air Conditioner Service Manual311 pg
- Air Conditioner Service Manual R22280 pg
- Air Conditioner Service Manual R22279 pg
- Air Conditioner Service Manual279 pg
- Air Conditioner Service Manual268 pg
- Air Conditioner Service Manual264 pg
- Air Conditioner Service Manual263 pg
- Air Conditioner Service Manual280 pg
- Air Conditioner Service Manual R22263 pg
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Error codes (145)
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 145 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 conversion152System is off by excessive increase of discharge temperature of constant speed…153System is off by excessive increase of discharge temperature of constant speed…154High pressure switch of sub3 outdoor unit operated by high pressure rising.155Wrong wiring at sub3 outdoor 3 phase (reverse phase or phase omission).156Transmission error between sub3 outdoor unit and main outdoor unit.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.161Suction 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 out of tolerable range.172Outdoor voltage sensing error for sub3; abnormal sensor measurement.173Failure 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 operation200Pipe detection error during auto-addressing; number of indoor units detected…201HR unit 1 liquid pipe temperature sensor error; open or short.202HR unit 1 sub-cooling inlet pipe temperature sensor error; open or short.203HR unit 1 sub-cooling discharge pipe temperature sensor error; open or short.204Transmission error between HR unit 1 and outdoor unit.205HR unit 2 liquid pipe temperature sensor error; open or short.206HR unit 2 sub-cooling inlet pipe temperature sensor error; open or short.207HR unit 2 sub-cooling outlet pipe temperature sensor error; open or short.208Transmission error between HR unit 2 and outdoor unit.209HR unit 3 liquid pipe temperature sensor error; open or short.21DC peak210HR unit 3 sub-cooling inlet pipe temperature sensor error; open or short.211HR unit 3 sub-cooling outlet pipe temperature sensor error; open or short.212Transmission error between HR unit 3 and outdoor unit.213HR unit 4 liquid pipe temperature sensor error; open or short.214HR unit 4 sub-cooling inlet pipe temperature sensor error; open or short.215HR unit 4 sub-cooling outlet pipe temperature sensor error; open or short.216Transmission error between HR unit 4 and outdoor unit.217HR unit 5 liquid pipe temperature sensor error; open or short.218HR unit 5 sub-cooling inlet pipe temperature sensor error; open or short.219HR unit 5 sub-cooling outlet pipe temperature sensor error; open or short.22Overcurrent of inverter compressor220Transmission error between HR unit 5 and outdoor unit.221HR unit 6 liquid pipe temperature sensor error; open or short.222HR unit 6 sub-cooling inlet pipe temperature sensor error; open or short.223HR unit 6 sub-cooling outlet pipe temperature sensor error; open or short.224Transmission error between HR unit 6 and outdoor unit.225HR unit 7 liquid pipe temperature sensor error; open or short.226HR unit 7 sub-cooling inlet pipe temperature sensor error; open or short.227HR unit 7 sub-cooling outlet pipe temperature sensor error; open or short.228Transmission error between HR unit 7 and outdoor unit.229HR unit 8 liquid pipe temperature sensor error; open or short.23Poor voltage charge for driving inverter compressor230HR unit 8 sub-cooling inlet pipe temperature sensor error; open or short.231HR unit 8 sub-cooling outlet pipe temperature sensor error; open or short.232Transmission error between HR unit 8 and outdoor unit.24High pressure switch of main outdoor unit240Central controller CNU connection failure; transmission failure between central…241Central controller data transmission error (sending error); CNU to central…242Central controller receive error; data length from CNU is longer than…243Central controller receive buffer overflow; excess data received.244Central controller to CNU data transmission failure; receiving time exceeds 3…245Central controller send timeout; data sending failure from central controller…246Central controller receive timeout; data receiving failure of central…25Low/over voltage250Central controller checksum error; received checksum differs from calculated…251Central controller receive zero error; length of received data is 0.252Central controller wrong address error; setting address and actual address are…32System 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.
Service modes (25)
- auto_addressingPress the address (red) button on Main PCB for 6 seconds
- auto_addressing_outdoor["Ensure power is on for all indoor and outdoor units.","Wait at least 3 minutes.","Press and hold…
- Auto-Addressing1
- Backup Operation (Constant Speed Compressor)On the main outdoor unit, set DIP switch
- Data Display Mode (Outdoor Unit Status)1
- Data Display Mode (Outdoor Unit)1
- data_display_modeTurn on DIP switch No.7 and No.8, then press and hold the auto-address push switch for 5 seconds.
- data_display_mode_outdoor["Turn on DIP switch No.7 and No.8 on the main outdoor PCB.","Press and hold the auto-address push…
- Forced Operation (Indoor Unit - Cooling Only Model)Press the forced operation (power) button on the indoor unit
- Forced Operation (Indoor Unit - Heat Pump Model)1. Press the forced operation button. 2. Indoor fan operates at low speed for about 15 seconds. 3…
- Forced Operation (Indoor Unit)Press the power/forced operation button on the indoor unit main body.
- 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_cooling_only_modelPress the forced operation button on the indoor unit main body.
- forced_operation_heat_pumpPress the forced operation button on the indoor unit main body.
- forced_operation_heat_pump_modelPress the forced operation button on the indoor unit main body
- forced_operation_indoor["Press the forced operation (power) button on the indoor unit main body."]
- Instant Indoor Unit Checking Mode1
- 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_cooling1. Set DIP switch
- instant_indoor_unit_checking_heating1. Set DIP switches
- Test Operation (Indoor Unit - Art Cool / Art Cool Wide)Press and hold the ON/OFF button on the indoor unit for 3-5 seconds until buzzer sounds 1 beep.
- test_operationPress and hold the ON/OFF button (or forced operation button) for 3-5 seconds until the buzzer…
- test_operation_art_cool_wideAfter supplying power to the main body, keep pressing the forced operation button for about 3…
- test_operation_indoorPress and hold ON/OFF button for 3-5 seconds until buzzer sounds 1 beep.
Full entry steps, exit procedures, and test sequences are available in Max.
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