LG Heat Pump Error Code G2

The G2 code on an LG heat pump signals either a total refrigerant loss in the outdoor unit or a compressor loading failure. Both conditions prevent the system from building the pressure differential needed for normal heating or cooling operation. The OLP (Over Load Protector) on the compressor may also have tripped as a result of overheating caused by either condition. A technician will need to check compressor terminal resistance, refrigerant pressures, and whether the compressor is actually running.

No. The G2 code indicates the system has either lost refrigerant or has a compressor that is not loading correctly. Running the system in this condition can cause permanent compressor damage and may worsen a refrigerant leak. The unit should be left off until the cause is diagnosed and repaired.

Repair costs vary significantly depending on the cause. Diagnosing and repairing a refrigerant leak, followed by a system recharge, typically ranges from a few hundred to over a thousand dollars depending on the refrigerant type and leak location. Compressor replacement is among the most expensive heat pump repairs, often ranging from several hundred to well over a thousand dollars including labor. Capacitor or contactor replacements are considerably less costly by comparison.

Some electrical checks, such as inspecting the contactor and testing capacitors, are within the range of experienced DIYers. However, if the G2 code is caused by refrigerant loss, handling or recharging refrigerant requires EPA Section 608 certification and is not a DIY repair. A compressor replacement is also a major repair best handled by a licensed HVAC technician.

A power reset may temporarily clear the G2 code, but the fault will return quickly if the underlying problem has not been resolved. If the OLP tripped due to overheating, it may reset after the compressor fully cools, but it will trip again if the root cause such as low refrigerant or a mechanical issue is still present. A reset alone is not a repair.