The bi-metal thermostat-trips, also known as the refrigerator defrost sensor, are used to detect when the temperature of the evaporator is getting hot enough to cause overheating. The power was cut off when the sensor tripped. Frost builds up on the evaporator fins of the refrigerator and freezer if the defrost sensor trips. To check the sensor for continuity, you can use the volt-ohm meter. If the sensor doesn't show continuity at 0 degrees F, replace it.
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