LG Aircon Error Codes

Likely cause: Faulty or disconnected indoor room-temperature thermistor, or a damaged sensor wire.

What to do: Check the sensor plug is seated; otherwise a technician should test and replace the sensor.

Likely cause: Faulty or disconnected pipe/outdoor thermistor or its wiring.

What to do: Needs a technician to measure the sensor resistance and replace if out of spec.

Likely cause: Loose/incorrect remote wiring or a wrong controller (single vs group) setting.

What to do: Power-cycle the unit; if it persists a technician should check the remote wiring and settings.

Likely cause: High condensate level from a blocked/dirty drain, or a faulty float switch/heat-sink sensor.

What to do: Check for blocked drainage and standing water in the tray; clearing usually needs a service visit.

Likely cause: Faulty interconnecting control wiring, loose terminals, or a control PCB fault.

What to do: Turn power off and on at the isolator; if it returns a technician must check the wiring and boards.

Likely cause: Faulty or disconnected indoor coil thermistor or its wiring.

What to do: Needs a technician to test and replace the coil sensor.

Likely cause: Compressor overload, or mismatched cooling/heating modes across indoor units on a multi-split.

What to do: On a multi-split, set all indoor units to the same mode; compressor over-current needs a technician.

Likely cause: Seized or faulty indoor fan motor, an obstruction, or a control PCB fault.

What to do: Check nothing is jamming the fan; a locked or non-running fan motor needs a technician.

Likely cause: Seized or faulty outdoor fan motor, loose connection, or a faulty PCB.

What to do: Requires a technician to test the outdoor fan motor and PCB.

Likely cause: Faulty or disconnected compressor discharge thermistor.

What to do: Needs a technician to test and replace the discharge sensor.

Likely cause: Faulty compressor windings, an inverter PCB/IPM fault, or abnormal load on the compressor.

What to do: Requires a technician to test the compressor and inverter board.

Likely cause: Compressor electrical fault, inverter PCB fault, or abnormal operating conditions.

What to do: Requires a technician to test the compressor windings, insulation, and run current.

Likely cause: Low/unstable supply voltage, failed capacitors, or an inverter PCB fault.

What to do: Requires a technician to check the supply voltage and inverter board.

Likely cause: Low/leaking refrigerant, blocked airflow or dirty coils raising pressure, or closed service valves.

What to do: A technician must check system pressures; a low-pressure trip usually means low or leaking refrigerant.

Likely cause: Mechanically seized compressor or a compressor/inverter electrical fault.

What to do: Requires a technician to test the compressor windings, insulation, and inverter outputs.

Likely cause: Faulty inverter PCB or reactor.

What to do: Requires a technician to inspect the inverter PCB and reactor.

Likely cause: High/unstable supply voltage, failed capacitors, or an inverter PCB fault.

What to do: Requires a technician to check the supply voltage and inverter board.

Likely cause: Low refrigerant charge, restricted airflow, or an overworked compressor.

What to do: A technician should check the refrigerant charge and airflow; often indicates low refrigerant.

Likely cause: Corrupted or faulty EEPROM/main control board.

What to do: Requires a technician to reseat or replace the outdoor PCB.

Likely cause: Dirty/blocked outdoor coil or filters, poor airflow, or non-condensables in the system.

What to do: Check the outdoor coil is clean and unobstructed; a wash and pressure check usually needs a technician.