Hi @tdobb ,
Is it only the fridge compartment that gets warm or does the freezer compartment warm up also in the ‘dormant period”?
Is the compressor running in the “dormant period”?
If both compartments warm up and the compressor is not running it seems as though there may be an intermittent problem with the defrost thermostat, part#14 - unit parts diagram.
This thermostat essentially times or controls the duration of the defrost cycle.
The defrost cycle occurs approximately once every 10 hours and takes about 20 minutes to complete. i.e. every ~10 hours the control board turns off the compressor and evaporator fan and turns on the defrost heater to melt any accumulated ice from the evaporator unit.
The defrost cycle is ended when the temperature in the freezer has risen to the defrost thermostat’s preset release temperature. It releases and this signals the control board to turn the heater off and turn the compressor and evaporator fan on again to drive the temperatures in both compartments back down to their set operating temperatures. When the temperature in the freezer compartment drops back to the defrost thermostat’s preset operating temperature, it re-operates in preparation for the next defrost cycle.
It may be that the defrost thermostat is intermittently not releasing to end the defrost cycle so the compressor and evaporator fan will not be restarted and the temperatures go up.
Here’s a video that shows how to test the bi-metal defrost thermostat
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