LG · Ductless air conditioner
CH54
Power reset onlyerror code
LG CH54 is a reverse-phase detection display that may follow a power outage or electrical work.
Market, product family, and model applicability
US · en-US · LG air-conditioning systems covered by the cited US guide that can report reverse phase
product family applicable: The official source applies at the product-family level. Exact controls can still vary by model.
Check the official model/manual lookup (opens in a new tab)What you can do now
Use one documented breaker reset and contact the contractor or service if CH54 persists.
- Use the air conditioner's documented breaker reset once.
Stop and get service when
Electrical-work-related CH54 belongs with the contractor; persistent CH54 requires professional inspection.
- Contact the electrical contractor if CH54 appeared after electrical work.
- Request professional inspection if CH54 persists.
Do not do
Do not perform live electrical testing or alter phase wiring.
Do not open electrical panels, test voltage, or repeatedly reset a breaker that will not remain on.
If the message returns
Request professional inspection if CH54 persists.
Source and scope
Official manufacturer source- Market and locale
- US · en-US
- Product family
- three-phase air-conditioning systems
- Official source last checked
- July 26, 2026
- Review status
- Automated evidence review completed · Owner-delegated approval
LG
[LG Air Conditioner] Guide to Error Codes · Official error-code index
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