LG Heat Pump Error Code P712

P712 means the compressor has been shut down by the high pressure sensor protection control 2. This is a safety feature that activates when refrigerant pressure in the system exceeds an allowable threshold. The compressor is stopped automatically to prevent mechanical damage. The underlying cause of the high pressure condition must be identified and corrected before the unit will operate normally.

No, you should not attempt to run the heat pump while P712 is active. The system has shut the compressor down intentionally to prevent damage from excessive pressure. Forcing the unit to run under high pressure conditions risks compressor failure and potential refrigerant circuit damage, which would result in much more costly repairs.

Repair costs vary widely depending on the root cause. Simple fixes like coil cleaning or filter replacement may cost between $75 and $200 for a service call. Refrigerant recharge or high pressure sensor replacement typically ranges from $150 to $450. If the compressor has sustained damage or the reversing valve requires replacement, costs can range from $600 to over $1,500 depending on parts and labor in your area.

Some causes of P712, such as a dirty outdoor coil or a clogged air filter, can be addressed by a knowledgeable homeowner through cleaning and basic maintenance. However, issues involving refrigerant charge, pressure sensor replacement, or reversing valve repair require a licensed HVAC technician with proper equipment. Attempting to work on the refrigerant circuit without certification is illegal in most jurisdictions.

A power reset may temporarily clear the fault and allow the unit to restart, but if the underlying cause of the high pressure condition has not been corrected, the P712 code will return and the compressor will shut down again. Repeated resets without addressing the root cause can stress the compressor and other components. A proper diagnostic inspection is needed to resolve the fault permanently.