Refrigerators by Romalon. Details: The thermostat senses the temperature increase in the evaporator during the cycle of defrosting and turns off when ice is melted. 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. Save your time and money now! There are no instructions included in this.