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If the bimetal thermostat fails open (no continuity when cold), the defrost heater never activates, causing heavy frost and ice to accumulate on the evaporator coils with no automatic defrost cycle.
Excessive ice buildup on the back wall of the freezer or on the evaporator coil fins, often leading to restricted airflow and reduced cooling performance throughout the refrigerator.
When ice blocks the evaporator, cold air cannot circulate properly into the fresh-food section, causing the refrigerator compartment to run warmer than the set temperature.
A shorted or stuck-closed bimetal can prevent the heater from shutting off, causing the freezer temperature to rise and food to thaw.
When frost is not melted during the defrost cycle, meltwater backs up and overflows the drain pan, leaking from the freezer into the fresh-food compartment below.
Insulating frost buildup forces the compressor to run non-stop trying to maintain temperature, dramatically increasing energy consumption and shortening compressor life.
💡 Pro Tip: How to Diagnose a Failed Bimetal Defrost Thermostat
Your part is likely the culprit if you notice any of the following:
⚠️ Thick frost or ice buildup on the back wall or evaporator coils of the freezer
⚠️ Refrigerator or freezer compartment running warm despite the compressor running continuously
⚠️ Water leaking from the freezer into the fresh-food compartment (blocked drain caused by unmelted frost)
⚠️ Appliance never completing a defrost cycle — defrost heater remains off even when frost is heavy
🔬 DIY Test: Use a multimeter set to continuity/ohms. When the bimetal is cold it should show zero resistance (closed circuit). Dip it briefly in warm water — it should then show open circuit (infinite resistance). If it fails either test, replace immediately. OEM reference price: ~$40–$44 from authorized Whirlpool parts dealers.
📦 What's in the Box
✅ 1× Bimetal Defrost Thermostat (L43-27°F / L8.9-16.7°C, clip-on, 7.9" 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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