LG Heat Pump Error Code P507

P507 means the heat pump has shut down the compressor because the high pressure sensor detected refrigerant pressure exceeding safe operating limits. This is a protective control function designed to prevent compressor damage. The unit will not restart until the high pressure condition is corrected or the sensor fault is resolved.

No. The P507 fault shuts the compressor down as a safety measure, so the unit is already protecting itself. Attempting to bypass or repeatedly reset the system without addressing the root cause can lead to compressor failure, which is a costly repair. Leave the unit off until the cause is identified and corrected.

Repair costs depend heavily on the cause. Coil cleaning or a service call for a refrigerant adjustment typically runs in the range of $100 to $300. Replacing a high pressure sensor may cost $150 to $400 including parts and labor. An outdoor fan motor replacement generally falls in the $250 to $600 range. Compressor replacement, if damage has already occurred, can run $1,000 to $2,500 or more.

Some causes of P507 are DIY-accessible, such as cleaning a blocked outdoor coil or removing debris from around the unit. However, diagnosing refrigerant pressure, correcting charge levels, or replacing the high pressure sensor requires EPA Section 608 certification and refrigerant handling equipment. If basic cleaning does not resolve the issue, a licensed HVAC technician should be called.

A reset may temporarily clear the fault and allow the compressor to restart, but if the underlying high pressure condition still exists, P507 will return quickly. Resetting without diagnosing the root cause risks repeated compressor shutdowns and potential long-term damage. Always identify and correct the cause before relying on a reset.