LG Heat Pump Error Code P510

P510 indicates the compressor has been shut down by the low-pressure sensor protection control. The system detected that refrigerant suction pressure dropped below the acceptable operating threshold, so the control board stopped the compressor to prevent internal damage. Common causes include refrigerant leaks, restricted coils, and a blocked filter drier.

No. The P510 code represents a protective shutdown, meaning the system has already stopped the compressor to prevent damage. Attempting to repeatedly restart the unit without resolving the root cause can accelerate wear on the compressor and other refrigerant circuit components. Leave the unit off until the cause is diagnosed and corrected.

A power cycle or control board reset may temporarily clear the P510 code and allow the compressor to restart, but if the underlying cause such as a refrigerant leak or restricted coil is not resolved, the error will return shortly after the unit attempts to operate. A reset alone does not fix the problem and should only be used as part of a structured diagnostic process.

Some causes, such as cleaning dirty coils or replacing a clogged air filter, can be handled without a technician. However, diagnosing and repairing refrigerant leaks or replacing a faulty low-pressure sensor requires EPA Section 608 certification and specialized equipment. It is recommended to have a licensed HVAC technician perform a full system pressure check before attempting further repairs.

Repair costs vary widely depending on the cause. Coil cleaning or an air filter replacement typically costs between $75 and $200. Refrigerant leak detection and recharge can range from $200 to $600 or more depending on the refrigerant type and the extent of the leak. Sensor replacement parts and labor can add another $100 to $300 to the total.