LG Heat Pump Error Code P707

P707 means the LG heat pump has shut down the compressor due to high pressure sensor protection control. The system detected that refrigerant pressure on the high side of the circuit exceeded the safe operating limit. This is a built-in safety feature that prevents compressor damage. The unit will not restart normally until the underlying cause of the high pressure condition is identified and corrected.

No. The P707 code means the system has already shut the compressor down as a protective measure, so the heat pump will not operate normally while the fault is active. Attempting to force the unit to run without resolving the high pressure condition risks severe compressor damage, refrigerant line stress, and potentially a dangerous pressure event. The system should remain off until a technician has diagnosed and corrected the cause.

Repair costs vary widely depending on the cause. Cleaning a blocked coil or reopening a service valve is a relatively low-cost service call, typically in the range of $75 to $200. Recovering and recharging refrigerant to correct an overcharge can add $150 to $400 depending on refrigerant type and quantity. Replacing a fan motor or high pressure sensor typically ranges from $200 to $600 including parts and labor, and compressor replacement, if the unit suffered damage, can run $800 to $2,000 or more.

Some steps, like checking that service valves are fully open or cleaning a blocked condenser coil, can be done without special tools. However, diagnosing refrigerant overcharge, testing fan motor performance, or replacing a high pressure sensor requires manifold gauges and refrigerant handling equipment that must be used by a certified technician. Attempting to adjust refrigerant charge without proper training can worsen the problem and create safety hazards.

A power reset may temporarily clear the error and allow the compressor to restart, but if the underlying cause of the high pressure condition is still present, the unit will trip P707 again, often quickly. Resetting without fixing the root cause can result in repeated compressor shutdowns and accelerated wear. A proper diagnosis using pressure gauges and component checks is needed before relying on a reset as a solution.