Model reference
LG LRNU12GSEV0
Air Conditioner
1 document92 error codes5 service modes
Available documentation
Service Manual
- Air Conditioner Service Manual R22312 pg
MyPros+ Max
Diagnose your LG LRNU12GSEV0.
- Step-by-step diagnostics from the service manual
- Test values, resistance specs, and wiring references
- Verified part numbers when replacement is needed
Start diagnosing
$29/month · Cancel anytime · Or $9.95 3-day pass
Error codes (92)
CodeMeaning
01Indoor unit room temperature sensor is open or short.02Indoor unit inlet pipe temperature sensor is open or short.03Wired remote controller communication error04Drain pump malfunction05Communication error between outdoor unit and indoor unit06Indoor unit outlet pipe temperature sensor is open or short.07Different operation mode between indoor unit and outdoor unit (all units must…09Indoor unit EEPROM error10Poor fan motor operation100Excessive rise of discharge temperature of constant speed compressor 1 of sub1…101Excessive rise of discharge temperature of constant speed compressor 2 of sub1…102Excessive rise of discharge temperature of constant speed compressor 1 of sub2…103Excessive rise of discharge temperature of constant speed compressor 2 of sub2…104Communication error from sub1 outdoor unit to main outdoor unit105Communication error between main PCB and fan main PCB (fan to outdoor).106Over-current of main outdoor fan motor (fan IPM fault).107Low voltage of fan motor driver.108Communication error from main PCB to fan PCB (outdoor to fan).109High pressure switch of sub1 outdoor unit operated due to high pressure rising.11Indoor unit communication error110Reverse connection or omitting connection of R, S, T power of sub1 outdoor unit.111Communication 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 due to high pressure rising.141Reverse connection or omitting connection of R, S, T power of sub2 outdoor unit.142Communication error from main outdoor unit to sub2 outdoor unit.143Excessive rise in high pressure of sub1 outdoor unit.144Excessive low pressure drop of sub1 outdoor unit.145Excessive rise in high pressure of sub2 outdoor unit.146Excessive low pressure drop of sub2 outdoor unit.147Low or high voltage of sub1 outdoor unit148Voltage detection circuit of sub1 outdoor unit is out of order.149Low or high voltage of sub2 outdoor unit150Voltage detection circuit of sub2 outdoor unit is out of order.151Outdoor 4-way (reversing valve) switching error173Failure of main constant speed compressor operation174Failure of sub1 constant speed compressor 1 operation.175Failure of sub1 constant speed compressor 2 operation.176Failure of sub2 constant speed compressor 1 operation.177Failure of sub2 constant speed compressor 2 operation.178Failure of sub3 constant speed compressor 1 operation.179Failure of sub3 constant speed compressor 2 operation.21DC peak / IPM fault or overcurrent to inverter compressor.22Overcurrent of inverter compressor23Poor voltage charge for driving inverter compressor24High pressure switch of main outdoor unit operated due to excessive high…25Low or over voltage32Excessive rise of inverter compressor discharge temperature causing system stop.33Excessive rise of constant speed compressor discharge temperature causing…34Excessive rise in high pressure of main outdoor unit causing compressor off via…35Excessive low pressure drop of main outdoor unit causing compressor off via 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 of outdoor unit is open or…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 of outdoor unit is open or short.49Outdoor voltage sensing error51Excessive capacity of indoor units connected compared to outdoor unit capacity…52Communication error from inverter PCB to main PCB53Communication error from indoor unit to main PCB of outdoor unit54Reverse connection or omitting connection of R, S, T power of main outdoor unit…57Communication error from main PCB to inverter PCB62Overheat of inverter PCB heat sink65Temperature sensor on the heat radiator panel of inverter PCB is open or short.
Service modes (5)
- Auto-Addressing1
- Data Display Mode (Outdoor Unit Status)1
- Forced Operation (Indoor Unit)Press the power/forced operation button on the indoor unit main body.
- Instant Indoor Unit Checking Mode1
- 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.
Full entry steps, exit procedures, and test sequences are available in Max.
Related LG air conditioner models
78,000+ service manuals · 160,000+ error codes · 55+ brands
Get Started$29/month · Cancel anytime · Or $9.95 3-day pass