Crankcase heater fault: what it can cause at low temperatures

The crankcase heater helps limit refrigerant migration into the compressor oil when the unit is not in operation.

Potential problem

If the heater is not working, the risk of oil foaming and difficult startup at low temperatures may increase.

What to check

Heater power supply, element resistance, and activation logic from the controller.

Diagnosis

Operation must be evaluated according to the service manual of the specific model.