LG Heat Pump Error Code G8

G8 on an LG heat pump indicates that heating operation has been restricted because outdoor temperatures are above 30°C (86°F). It can also appear when refrigerant charging in heating mode is attempted while the outdoor unit temperature exceeds 15°C. This is a built-in operational limit, not a component failure. The system will resume heating automatically once temperatures fall within the acceptable range.

A manual reset will not permanently clear G8 if the outdoor temperature is still above 30°C, because the restriction is based on live temperature readings rather than a stored fault. The code will return immediately after a reset if the triggering condition is still present. The code clears on its own once conditions return to within the allowed operating range.

In the vast majority of cases, there is no repair cost because G8 is not a component failure. If the code is appearing incorrectly due to a faulty outdoor ambient temperature sensor, sensor replacement and labor costs can vary depending on the technician and region, generally ranging from moderate to higher cost depending on parts availability. A service call to diagnose an incorrectly triggering G8 would typically run in the range of a standard diagnostic fee.

In most cases, no fix is needed. The G8 code clears automatically once outdoor ambient temperatures drop below 30°C and the system can safely resume heating operation. If you are a technician performing refrigerant charging, wait for the outdoor unit temperature to fall below 15°C before continuing. If G8 appears during genuinely cool weather, check the outdoor ambient temperature sensor for faults.

No, G8 is not a safety hazard. It is a protective operational restriction that prevents the heat pump from running heating cycles under conditions where efficiency would be very low or where refrigerant handling could be compromised. The system is functioning as designed when this code appears.