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Ice and frost accumulate heavily on evaporator coils because the defrost thermostat fails to signal the heater to activate, blocking airflow and cooling performance.
Refrigerator compartment temperature rises above safe levels due to frozen-over evaporator coils that cannot exchange heat properly, caused by a failed defrost thermostat.
Freezer fails to maintain proper temperature because ice-blocked evaporator coils restrict airflow, a direct result of defrost thermostat failure.
Fresh food in the refrigerator section freezes unexpectedly when the thermostat malfunctions and disrupts normal temperature regulation cycling.
Thick slabs of ice form on the freezer back panel and evaporator because the defrost cycle cannot complete without a functioning bimetal thermostat to control the heater.
Compressor runs non-stop trying to compensate for poor cooling caused by frost-clogged evaporator coils, driving up energy consumption and wear.
💡 Pro Tip: Diagnosing a Faulty Defrost Thermostat
Your part is likely the culprit if you notice any of the following:
⚠️ Excessive ice or frost buildup on the evaporator coils inside the freezer compartment
⚠️ Freezer section not defrosting — thick ice slab visible behind the back freezer panel
⚠️ Refrigerator compartment running too warm even though the freezer feels cold
⚠️ Refrigerator or freezer running too cold, freezing fresh food in the fridge section
🔍 Diagnostic Tip: Set your multimeter to continuity mode and test the thermostat leads at a temperature of 15°F or below. A healthy thermostat shows continuity when cold. If there is no continuity at that temperature, the thermostat is defective and must be replaced.
📦 What's in the Box
✅ 1× Bimetal Defrost Thermostat (W10225581 / WPW10225581 compatible) with mounting clip and 2 wire leads
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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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