Dennis W Oakwood , IL November 30, 2015 Appliance: General Electric Refrigerator GSS22JFMCCC Ge Refrigerator Gss22jfmccc: The automatic defrost was not functioning properly frozen evaporator coil. How to replace Refrigerator Temperature Sensor. The thermistor (temperature sensor) was the problem. I bought a heater and thermostat also just to replace the original. Refrigerator is 14 years old. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes