LG Heat Pump Error Code G7

The G7 code means the indoor unit heat exchanger temperature dropped below -4°C for more than 40 seconds while the system was running in cooling mode. This is a freeze protection fault that causes the unit to shut down to prevent compressor damage. It points to an issue with airflow, refrigerant charge, or a sensor or valve component in the refrigerant circuit.

No, you should not attempt to run the system while the G7 fault is active. Operating a heat pump with a frozen coil or low refrigerant can cause liquid refrigerant to return to the compressor, which can permanently damage the compressor. Allow any ice to thaw and resolve the underlying fault before restarting the unit.

Repair costs vary widely depending on the cause. Replacing an air filter is minimal, typically under $30. A refrigerant leak diagnosis, repair, and recharge can range from $200 to $600 or more depending on the extent of the leak. Replacing a thermistor or expansion valve can range from $150 to $500 including labor. A full compressor replacement, if the unit was run while frozen for an extended period, can cost $800 to $2,000 or more.

Some causes of G7 are DIY-friendly, such as replacing a clogged air filter, clearing blocked return vents, or cleaning dirty indoor coil fins. However, if the cause is low refrigerant charge, a faulty expansion valve, or a failed thermistor, a licensed HVAC technician will be needed to safely diagnose and repair those components.

A reset may temporarily clear the G7 code and allow the unit to restart, but if the underlying condition causing the freeze is still present, the fault will return once the coil temperature drops below -4°C again for over 40 seconds. A reset is only a lasting fix if the root cause, such as a dirty filter, has already been corrected.