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Frozen evaporator coils block airflow into the fresh food section, causing refrigerator temps to rise while the freezer remains cold.
A failed thermostat stays open and never signals the defrost heater to activate, leaving coils permanently frozen over.
Without a working defrost cycle, frost accumulates on the evaporator fins until airflow is completely blocked.
When ice buildup is severe enough, even freezer temperatures rise as the compressor can no longer overcome blocked airflow.
The compressor runs non-stop trying to compensate for poor cooling caused by frost-blocked evaporator coils.
💡 Pro Tip: Is Your Defrost Thermostat the Culprit?
Your part is likely the culprit if you notice any of the following:
⚠️ Refrigerator section is warm but freezer stays cold
⚠️ Evaporator coils are completely frozen over / solid block of ice on back wall
⚠️ Defrost cycle never runs — frost never melts off coils
⚠️ Refrigerator runs constantly but fails to reach set temperature
🔍 Quick test: Set your multimeter to continuity mode. At room temperature the thermostat should show continuity (closed circuit). If it reads open at room temp, it has failed and must be replaced. Always check the defrost heater as well — a blown heater is often the root cause that kills the thermostat.
📦 What's in the Box
✅ 1× Defrost Bi-Metal Thermostat (L42-30F, 1/4" clip, 7.5" + 24.5" 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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