LG Heat Pump Error Code P705

P705 indicates an outdoor unit overload 2 protection control error. This means the system has detected that a component in the outdoor unit, most likely the compressor or its associated circuitry, is operating beyond safe current or thermal limits. The unit shuts down automatically to prevent damage. A technician should inspect the outdoor unit before the system is restarted.

No, you should not attempt to force the unit to run while the P705 error is active. The overload protection is designed to prevent serious damage to the compressor, which is the most expensive component in the system. Repeatedly resetting and restarting the unit without addressing the underlying cause can shorten compressor life significantly or cause a complete failure.

Resetting the unit may temporarily clear the P705 code and allow the heat pump to restart, but the error will return if the underlying cause has not been corrected. In cases of compressor overload, repeated cycling without a fix can cause cumulative damage. A reset should only be used as part of a diagnostic process, not as a long-term solution.

Some basic checks are within reach for a knowledgeable homeowner, such as clearing debris from around the outdoor unit and cleaning a visibly dirty condenser coil. However, diagnosing refrigerant charge issues, testing compressor windings, and evaluating electrical components requires tools and training that typically require a certified HVAC technician. Attempting repairs on pressurized refrigerant circuits without proper certification is not recommended.

Repair costs vary widely depending on the root cause. A coil cleaning or minor electrical repair might cost anywhere from $75 to $250. A refrigerant recharge could range from $150 to $400 depending on refrigerant type and quantity needed. If the compressor requires replacement, costs can range from $900 to $2,500 or more, including labor, making it important to accurately diagnose the fault before committing to parts.