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When the defrost thermostat fails open, the defrost heater never activates and ice accumulates heavily on the evaporator coils, restricting airflow and cooling.
A faulty thermostat prevents the defrost cycle from completing, causing ice-blocked coils that reduce cooling efficiency and raise internal temperatures.
If the thermostat fails shorted, the defrost heater may run non-stop or the compressor may never shut off, causing the unit to run too long without reaching set temperature.
An out-of-spec thermostat can disrupt the defrost cycle timing, causing erratic temperature swings that may freeze fresh food compartment contents.
💡 Pro Tip: How to Diagnose a Failed Defrost Thermostat
Your part is likely the culprit if you notice any of the following:
⚠️ Freezer or refrigerator is too warm despite the compressor running
⚠️ Heavy frost or ice buildup on the evaporator coils in the freezer section
⚠️ Appliance runs continuously and never shuts off
⚠️ Food in the refrigerator compartment is freezing unexpectedly
🔍 Diagnostic Tip: Remove the thermostat and test with a multimeter. At room temperature (68°F) the sensor should read approximately 6.2 kΩ. Submerged in ice water (~32°F) it should read approximately 16.3 kΩ. No continuity at room temperature means the thermostat has failed and must be replaced.
📦 What's in the Box
✅ 1× Defrost Thermostat 297216600 (plastic housing, 4-in white lead / 6-in red lead, mounting clip included)
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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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