The defrost heater and the defrost thermostat in your fridge are located in the freezer, behind the rear panel in the evaporator area. Defrost timing controls by the main control board in the fresh food compartment.
The first thing I would check for continuity is the defrost thermostat. It must be closed while it's cold. Replace it if it's open.
Then check for continuity the defrost heater (with at least one wire disconnected). Replace if it's open.
If there is nothing wrong then the control board has to be replaced.
- The part number for the defrost heater is
AP3502547
- The part number for the control board is
AP4318990
In order to provide the right part number for the defrost thermostat I need the serial number of the fridge.
Gene.