ERROR CODE EXPLAINED
LG Air Conditioner
LG Air Conditioner P4 Error Code
What it means
LG says P4 can be a model-dependent display for an over-temperature protection condition also associated with CH61/CH34.
Try this first
- If the outdoor unit is on an enclosed balcony, open the ventilation window or insect screen.
- Clear clutter or other obstacles around the outdoor unit so hot air can escape.
- If the outdoor unit sits below or far from the ventilation opening, correct its placement or use an air guide as applicable.
- If the code occurs in heating mode, clean the indoor-unit filter if it is dusty.
- Unplug the air conditioner or turn off its circuit breaker, wait 5 minutes, then restore power.
- If the code returns, request service.
Can I keep using it?Correct airflow or filter restrictions and reset the unit before returning it to normal use.
Repair usually required?Service is recommended if P4 returns after ventilation, filter, and reset checks.
If the error keeps returning
Use the linked official LG Help Library article for the manufacturer procedure.
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.