Norcold Refrigerator Thermistor/Lamp Assembly Fits 1200 Models. The problem may be with the Thermistor and Lamp assembly. The Thermistor keeps your refrigerator operating correctly by allowing the refrigerator to stay within a range of temperatures. The cooling cycle will turn on if the temperature rises too high. Refer to manufacturer recommendations to ensure a proper fit. Quick and easy installation. Features of Norcold 621742 Refrigerator Thermistor/Lamp Assembly Fits 1200 Models Thermistor and lamp keep your refrigerator working correctly Durable metal construction Compatible with Norcold's 1200 refrigerator models Follow manufacturer recommendations to ensure proper fit and usage Designed for quick and easy installation Package Contents: Norcold 621742 Refrigerator Thermistor/Lamp Assembly Fits 1200 Models Norcold 621742: Refrigerator Thermistor/Lamp Assembly Fits 1200 Models