LG Heat Pump Error Code P708

P708 indicates the compressor has been shut down by high pressure sensor protection control 2. The system detected that refrigerant pressure on the high side of the circuit exceeded a safe operating limit, so the control board commanded the compressor to stop to prevent damage. This is a protective fault that requires identifying and correcting the root cause before the system can resume normal operation.

No. The P708 fault code means the system has already shut the compressor down as a safety measure. Attempting to force the unit to run or repeatedly resetting it without addressing the underlying cause can result in serious damage to the compressor, which is a costly component. Leave the unit off until a technician can inspect and repair the system.

Repair costs depend entirely on the root cause. A coil cleaning service typically runs in the range of $75 to $200. A refrigerant recharge or recovery and recharge can cost $150 to $500 or more depending on refrigerant type and quantity. Replacing a high-pressure sensor may run $100 to $300 including labor, while an outdoor fan motor replacement can range from $200 to $600 or higher depending on the model and labor rates in your area.

Some causes, such as cleaning a dirty outdoor coil or clearing debris blocking airflow around the outdoor unit, can be addressed by a homeowner. However, issues involving refrigerant charge, sensor replacement, or fan motor failure require a certified HVAC technician with proper tools and refrigerant handling credentials. Attempting to work on the refrigerant circuit without certification is illegal in many regions and can cause further system damage.

A power reset may temporarily clear the fault code and allow the system to restart, but if the underlying cause of the high pressure condition has not been resolved, the P708 error will return, often quickly. Repeated high pressure trips can cause additional wear on system components, so a reset should only be performed after the root cause has been identified and corrected.