CH 01
Indoor Unit Communication Error
- Turn OFF power for 5 minutes.
- Inspect indoor wiring connections.
- Check communication cable damage.
- Restart the unit.
CH 02
Indoor Coil Sensor Error
- Inspect indoor sensor wiring.
- Clean evaporator coil.
- Check loose connectors.
- Replace faulty sensor if needed.
CH 03
Drain Pump Error
- Check drain hose blockage.
- Inspect drain pump operation.
- Clean drain pan.
- Reset power to the unit.
CH 04
Float Switch Error
- Inspect float switch for debris.
- Check water overflow inside unit.
- Clean condensate tray.
- Replace defective float switch.
CH 05
Outdoor Communication Failure
- Inspect outdoor unit wiring.
- Check breaker and power supply.
- Verify communication cable connection.
- Restart both indoor and outdoor units.
CH 06
DC Link Voltage Error
- Check incoming voltage stability.
- Inspect inverter PCB.
- Turn OFF unit for 10 minutes.
- Contact technician if error returns.
CH 07
Mode Conflict Error
- Ensure all indoor units use same mode.
- Do not mix cooling and heating modes.
- Restart the system.
- Reset central controller if applicable.
CH 09
EEPROM Error
- Disconnect power for 10 minutes.
- Inspect PCB for damage.
- Check firmware issues.
- Replace PCB if needed.
CH 10
Fan Motor Issue
- Inspect indoor fan motor.
- Remove dust buildup.
- Check fan blade movement.
- Replace faulty motor if needed.
CH 21
DC Compressor Overload
- Turn OFF the air conditioner.
- Check for overheating.
- Inspect refrigerant levels.
- Contact HVAC technician.
CH 22
DC Compressor Problem
- Inspect compressor wiring.
- Check inverter board.
- Restart the unit.
- Professional service may be required.
CH 23
DC Link Low Voltage
- Verify stable power supply.
- Inspect electrical connections.
- Check circuit breaker.
- Restart the air conditioner.
CH 26
IPM Error
- Turn OFF power immediately.
- Inspect inverter module.
- Check for overheating signs.
- Contact LG service center.
CH 29
Compressor Phase Error
- Check electrical phase connections.
- Inspect compressor wiring.
- Verify correct voltage supply.
- Contact qualified technician.
CH 32
High Pressure Switch Error
- Clean outdoor condenser coil.
- Ensure proper ventilation.
- Check refrigerant pressure.
- Restart the unit after cooling.
CH 33
Low Pressure Switch Error
- Inspect for refrigerant leaks.
- Check air filter blockage.
- Verify proper airflow.
- Contact technician for recharge.
CH 38
Refrigerant Leak Detected
- Turn OFF the system immediately.
- Inspect for oil residue near pipes.
- Do not continue operation.
- Schedule professional leak repair.
CH 44
Outdoor Temperature Sensor Error
- Inspect outdoor sensor wiring.
- Clean outdoor unit.
- Check loose connectors.
- Replace faulty sensor.
CH 54
Phase Reversal Error
- Turn OFF power immediately.
- Check incoming power phases.
- Correct wiring sequence.
- Contact electrician if needed.
CH 67
PCB Communication Error
- Disconnect power for 10 minutes.
- Inspect PCB wiring connections.
- Check for moisture damage.
- Replace faulty PCB if necessary.