If your refrigerator freezer is not defrosting, or your refrigerator is not cooling, it could be due to a bad defrost thermostat.
The defrost thermostat detects the temperature of the evaporator coils inside the freezer portion of a refrigerator. Cold air from inside the freezer is then pushed into the refrigerator. When the temperature of the evaporator coils drops, the defrost thermostat turns on and allows power to flow to the defrost heater. The defrost heater then melts the frost and ice off of the evaporator coils, allowing the proper temperatures to be maintained in your freezer and refrigerator.
If the defrost thermostat stops working, then the defrost heater never turns on and melts the frost on the evaporator coils. This can cause the coils inside the freezer to ice up and stop producing cold air.
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