LG Heat Pump Error Code E442

E442 indicates that a refrigerant charging operation was attempted while the unit was in heating mode and the outdoor temperature was above 15°C (59°F). LG heat pumps restrict refrigerant charging under these conditions because the charge measurement will be inaccurate at warmer ambient temperatures in heating mode. This is a procedural warning rather than a component failure code.

The E442 code is tied specifically to a refrigerant charging service procedure, not to normal operation. If the code appeared during a service call and the technician has not completed the charging process, the unit may be low on refrigerant, which can affect performance and potentially stress the compressor over extended use. Contact your technician to confirm the current refrigerant status before running the unit regularly.

If E442 appeared during a routine service call where the technician simply needs to return under cooler conditions to complete the charge, the added cost may be minimal, typically just an additional service visit fee in the range of $75 to $150 depending on the provider. If the code is related to a faulty outdoor temperature sensor, sensor replacement parts and labor can range from $100 to $300. Refrigerant itself, if the system needs a full charge, can add $150 to $500 or more depending on refrigerant type and quantity needed.

Homeowners cannot resolve this error on their own because it involves refrigerant charging, which is a regulated procedure that requires a certified HVAC technician with proper equipment and refrigerant handling credentials. If the error appeared during a service visit, the technician will need to reschedule the charging procedure for conditions with a cooler outdoor temperature below 15°C.

A power reset may clear the E442 display temporarily, but it will not address the underlying condition that triggered it. If refrigerant charging was not completed correctly due to the temperature restriction, the system may still be improperly charged. The appropriate fix is completing the refrigerant charging procedure under the correct ambient temperature conditions, not simply resetting the unit.