LG Heat Pump Error Code P732

P732 indicates that the outdoor unit discharge temperature sensor 2 has detected a temperature high enough to trigger the system's protection control. The heat pump shuts down or limits operation to protect the compressor from damage. This code points to a refrigerant, airflow, or sensor issue in the outdoor unit and requires professional diagnosis to resolve safely.

No, you should not continue operating the heat pump when this code is active. The P732 protection code exists specifically to prevent compressor damage from overheating. Repeatedly resetting and restarting the unit without addressing the underlying cause can lead to compressor failure, which is a costly repair. Leave the unit off until the cause is diagnosed and corrected.

Repair costs vary widely depending on the cause. A refrigerant recharge or coil cleaning might range from $150 to $400, while replacing a thermistor could fall in the $100 to $300 range including labor. If the expansion valve or outdoor fan motor needs replacement, costs could range from $300 to $700 or more. A compressor replacement, in a worst-case scenario, can range from $1,000 to $2,500 or higher depending on the unit.

Some basic checks, such as clearing debris from the outdoor unit or cleaning the coil, can be done without specialized tools. However, diagnosing refrigerant charge issues, testing thermistor resistance, or replacing components requires EPA certification for refrigerant handling and proper HVAC tools. It is strongly recommended to contact a licensed HVAC technician for a full diagnosis.

A power reset may temporarily clear the error and allow the unit to restart, but if the underlying cause is still present, the code will return. Resetting without repair is not a solution and can accelerate wear on the compressor. The error should be properly diagnosed and the root cause addressed before returning the unit to normal operation.