ERROR CODE EXPLAINED
LG Air Conditioner
LG Air Conditioner CH66 Error Code
What it means
The air conditioner detected a communication-line or refrigerant-piping connection problem.
Try this first
- If recently installed or relocated, contact the installer.
- If the unit was operating normally, disconnect power for about 5 minutes.
- Restore power and check whether the code returns.
Can I keep using it?⚠ Check before continued use
Repair usually required?⚠ Service may be required
If the error keeps returning
If CH66 returns after the recommended troubleshooting, LG recommends inspection or service.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.