LG Air Conditioner Error Code E445

E445 indicates a CCH (Crankcase Heater) malfunction combined with a sump sensor miswiring error. The system has detected that either the CCH connector is not properly connected to the PCB, or the sump temperature sensor has become separated from the compressor. The unit shuts down to protect the compressor from damage that could result from refrigerant accumulating in the sump.

No, you should not continue operating the unit with E445 active. The crankcase heater protects the compressor from liquid refrigerant accumulation during off cycles, and running without this protection can cause serious mechanical damage to the compressor, particularly in cooler ambient conditions. Resolving the fault before resuming operation is strongly advised.

Repair costs vary depending on the cause. If the fix is simply reseating a connector or reattaching the sump sensor, you may only pay a service call fee, typically in the range of $75 to $150. If the crankcase heater element needs replacement, parts and labor can range from $150 to $400. A PCB replacement represents the higher end of the cost range, potentially $300 to $600 or more depending on the unit model and labor rates in your area.

Some causes of E445 are accessible to a knowledgeable DIYer. You can inspect the CCH connector at the PCB and reseat it if loose, and check whether the sump sensor is properly attached to the lower part of the compressor. However, testing CCH resistance at 500 to 700 ohms and working inside the outdoor unit requires basic electrical knowledge and a multimeter. If wiring or component replacement is needed, a certified HVAC technician is recommended.

A power reset may temporarily clear the displayed code, but if the underlying issue such as a disconnected CCH connector, separated sump sensor, or failed heater element has not been corrected, the error will return. Resetting without diagnosing and fixing the root cause does not resolve the fault and leaves the compressor unprotected.