LG Heat Pump Error Code P506

P506 indicates an outdoor unit overload protection control error for overload zone 3. The system has detected that current draw or thermal conditions in the outdoor unit have exceeded safe operating limits. The heat pump shuts down to prevent damage to the compressor or motor windings. A technician should inspect refrigerant charge, airflow, and compressor condition before restarting the unit.

No, you should not attempt to force the system to run while P506 is active. The overload protection has engaged specifically to prevent component damage, and bypassing or repeatedly resetting it without resolving the underlying cause can lead to compressor failure. Leave the unit off and contact a qualified technician for diagnosis.

Repair costs vary widely depending on the root cause. A coil cleaning or refrigerant recharge might cost anywhere from $100 to $400. Replacing an overload relay or thermistor could range from $150 to $500 including labor. Compressor replacement is significantly more expensive, typically falling in the range of $1,000 to $2,500 or more depending on the unit size and local labor rates.

Some contributing factors, such as clearing debris from the outdoor coil or restoring proper airflow clearance around the unit, can be addressed without professional tools. However, diagnosing compressor current draw, testing refrigerant pressures, or replacing electrical components like the overload relay or control board requires specialized tools and technical knowledge. Refrigerant work also requires EPA 608 certification in the United States, so those tasks must be handled by a licensed technician.

A reset may temporarily clear the error and allow the system to restart, but the fault will return if the underlying cause has not been corrected. Repeated triggering of the overload protection significantly shortens compressor life. A reset is only appropriate as a first step while arranging for a proper service call, not as a long-term solution.