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Refrigerator compartment stays warm or fails to reach set temperature even after extended runtime on gas or electric.
Items in the fresh food compartment freeze solid because the failed thermistor cannot signal the control board to shut off cooling.
Cooling unit runs continuously or cycles on/off too frequently due to incorrect resistance readings from a degraded thermistor.
Fins frost over heavily because the thermistor fails to detect low temperatures and stop the cooling cycle at the appropriate threshold.
💡 Pro Tip: Is Your Norcold Thermistor Failing?
Your part is likely the culprit if you notice any of the following:
⚠️ RV refrigerator runs but does not cool — compartment stays warm even after hours of operation
⚠️ Food in the refrigerator section is freezing solid even when set to a normal temperature
⚠️ Cooling unit cycles on and off erratically or runs continuously without reaching setpoint
⚠️ Radiator fins are frosting over excessively due to unregulated temperature sensing
Before replacing, visually inspect the 4-pin connector at the lamp bracket for corrosion or loose pins. Use a multimeter to check thermistor resistance — a healthy NTC thermistor should show decreasing resistance as temperature rises. If resistance reads open (OL) or does not change with temperature, the thermistor has failed and must be replaced.
📦 What's in the Box
✅ 1× Norcold 636658 Thermistor Assembly with 4-Pin Connector & Wire Harness (replaces 620871)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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