System displays CH22 and will not start or stops during operation.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power at the main breaker and outdoor disconnect before inspection. High DC voltages are present on the inverter board.
Steps:
- Check supply voltage: Have a qualified person measure line voltage at the outdoor unit. If it is outside the range specified on the nameplate, contact your utility or an electrician.
- Inspect wiring: Ensure all line and ground connections are tight and that there are no signs of arcing or overheating at terminals.
- Power reset: After correcting any wiring issues, leave power off for 10 minutes, then restore and test.
Technician required: If CH22 persists with correct supply voltage, the outdoor inverter PCB is likely defective and must be replaced by a professional familiar with LG inverter systems.
Repair Difficulty
Required Part
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