This thermostat assembly is used in refrigerator units and freezers as a sensor. The thermostat senses the temperature increase in the evaporator during the cycle of defrosting and turns off when ice is melted. If you have any of the following symptoms, replacing your appliance could solve the problem: fridge does not start, is too warm, too cold, runs too long, or will not start. The tools needed for this repair project is a putty knife, Phillips and flat blade screw driver, 1/4 inch nut driver, and needle nose pliers. Remember to unplug refrigerator from power source as a safety precaution. Refer to the manual provided by the manufacturer for further installation instructions.