Juan G West Orange , NJ July 18, 2015 Appliance: General Electric Refrigerator GSS20IEMBWW Ge Refrigerator Gss20iembww: The frezzer was not working properly. How to replace Defrost Thermostat. I change the thermostat and the defrost heater kit 1 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes