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Model reference

LG ARNU48GTMC2

Air Conditioner

2 documents60 error codes14 service modes

Available documentation

Service Manual

  • Air Conditioner Service Manual - Outdoor Unit R410A140 pg
    Covers this model
  • Air Conditioner Service Manual109 pg
    Covers this model
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Error codes (60)

CodeMeaning
01Indoor unit air temperature sensor is open or short circuit.02Indoor unit inlet pipe temperature sensor is open or short circuit.03Transmission error between wired remote controller and indoor unit04Drain pump malfunction05Transmission error between indoor unit and outdoor unit06Indoor unit outlet pipe temperature sensor is open or short circuit.07Different operation mode error09Indoor unit EEPROM error10Indoor unit BLDC fan motor failure104Transmission error between outdoor units105Transmission error between fan PCB and inverter PCB106Outdoor unit fan PCB IPM fault107Fan DC link low voltage error11Indoor unit transmission error113Outdoor unit liquid pipe (condenser) temperature sensor error114Outdoor unit subcooling inlet/outlet temperature sensor error151Function error of 4-way (reversing) valve173Constant speed compressor fault193Fan PCB heatsink temperature high194Fan PCB heatsink temperature sensor error21Inverter PCB assembly IPM fault22Inverter PCB assembly AC input overcurrent error23Inverter compressor DC link low voltage24High pressure switch25Input voltage high/low error26Inverter compressor start failure28Inverter DC link high voltage error29Inverter compressor overcurrent32Over-increase discharge temperature of inverter compressor33Over-increase discharge temperature of constant speed compressor
View all 60 error codes
34Over-increase of high pressure35Excessive drop of low pressure40Inverter compressor CT sensor fault41Inverter compressor discharge pipe temperature sensor error42Low pressure sensor error43High pressure sensor error44Outdoor unit air temperature sensor error45Outdoor unit heat exchanger temperature sensor (A) error46Outdoor unit compressor suction temperature sensor error47Constant speed compressor discharge temperature sensor error48Outdoor unit heat exchanger temperature sensor (B) error503-phase power omission error51Over-capacity52Transmission error between inverter PCB and main PCB53Transmission error from indoor unit to main PCB of outdoor unit54Wrong connection of 3-phase power supply cable59Slave outdoor unit mixed installation60Inverter PCB EEPROM error67Fan lock error70Constant speed compressor CT sensor error71Inverter input current CT sensor error (PFC)73AC input instant overcurrent error743-phase power unbalance75Fan CT sensor error76Fan DC link high voltage error77Fan overcurrent error78Fan motor hall sensor error79Fan starting failure error86Main PCB EEPROM error87Fan PCB EEPROM error

Service modes (14)

  • Black Box Data Loading["Stop IDU and ODU.","Press the black button on main PCB for 5 seconds.","EEPROM data loads to main…
  • forced_operation["Press the forced operation button on the main unit of the appliance."]
  • Indoor Unit Forced Operation (Cooling)["Set Master ODU SW01B DIP switch positions 1,2 ON.","Power must be off when changing DIP switch…
  • Indoor Unit Forced Operation (Heating)["Set Master ODU SW01B DIP switch positions 1,2,3 ON.","Power must be off when changing DIP switch…
  • Manual Emergency Operation (Manual Backup)["Identify which compressor is broken using troubleshooting guide.","Turn off the power.","Set DIP…
  • Night Low Noise Function["Set Master ODU DIP switch No.12+14 ON.","Perform main PCB power reset.","Select RPM step
  • Pump Down["Close liquid SVC valve of each unit
  • Pump Out["Close liquid SVC valve of each unit. Open gas SVC valve of each unit. Close high/low pressure…
  • Refrigerant Auto Charging["Install the refrigerant charging device (manifold, capillary assembly, refrigerant vessel…
  • Refrigerant Checking Function["Wait 3 minutes after power reset.","Set DIP switch
  • Sensor Checking Function["Wait 3 minutes after power reset.","Set DIP switch on main PCB
  • Static Pressure Compensation Mode["For high static pressure (Max RPM 930)
  • test_operation["Supply power to the main body.","Press and hold the forced operation (ON/OFF) button for…
  • Vacuum Mode["Power reset ODU.","Set Master Main PCB DIP switch No.11,14 ON.","Power reset.","Press the black…

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

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