LG Heat Pump Error Code P505

P505 indicates an outdoor unit overload 2 protection control error. This means the system detected that the outdoor unit was operating under an excessive load condition and activated its protection circuit to prevent damage. The fault is typically related to the compressor, condenser fan motor, refrigerant charge levels, or restricted airflow around the outdoor unit.

No, you should not attempt to force the system to continue operating while P505 is active. The overload protection has engaged specifically to prevent damage to expensive components like the compressor. Continuing to run the system without resolving the underlying cause could result in permanent compressor failure or other costly damage.

Repair costs vary widely depending on the root cause. A refrigerant recharge or coil cleaning service might range from around $150 to $400. A condenser fan motor replacement could fall in the $300 to $600 range including labor. Compressor replacement is the most expensive scenario and can range from $1,000 to $2,500 or more depending on the unit size and labor rates in your area.

Some basic checks, such as clearing debris from around the outdoor unit and cleaning the condenser coil fins, can be done by a homeowner. However, diagnosing electrical components like the compressor and fan motor, and checking refrigerant levels, requires proper tools and certifications. It is strongly recommended to have a licensed HVAC technician perform the full diagnosis.

A power reset may temporarily clear the code and allow the unit to restart, but if the underlying cause of the overload condition has not been addressed, the error will return. Repeated overload events without repair can shorten component lifespan significantly. A reset should only be used as a temporary measure while awaiting professional service.