ERROR CODE EXPLAINED
LG Air Conditioner
LG Air Conditioner CH91 Error Code
What it means
The air conditioner detected an installation or piping problem, commonly during a test run.
Try this first
- If recently installed or relocated, contact the installer.
- Have the refrigerant piping connections checked.
- If the unit was previously operating normally, disconnect power for about 5 minutes and restart.
Can I keep using it?⚠ Check before continued use
Repair usually required?⚠ Service may be required
If the error keeps returning
If CH91 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.