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When the defrost control assembly fails, frost builds up unchecked on the evaporator coils behind the freezer back panel, blocking airflow and causing both compartments to warm up.
A faulty sensor fails to trigger defrost cycles, leading to ice blockage over the evaporator. The fridge section can rise to near room temperature even while the compressor runs.
If the thermal fuse inside the assembly has opened, the defrost heater never receives power and frost accumulates continuously. Replacing this assembly restores automatic defrost operation.
A shorted or out-of-spec thermistor can report false temperatures to the control board, causing the defrost heater to activate too often, wasting energy and over-warming the freezer.
Blocked evaporator coils force the compressor to run longer cycles to maintain set temperatures, significantly increasing energy use. Restoring proper defrost cycles reduces runtime and lowers electricity bills.
💡 Pro Tip: How to Confirm Your Defrost Control Assembly Has Failed
Your part is likely the culprit if you notice any of the following:
⚠️ Thick frost or ice sheet covering the evaporator coils behind the freezer back panel
⚠️ Refrigerator section warming up (near room temperature) while the freezer still runs
⚠️ Defrost cycle never initiating, or running continuously without stopping
⚠️ Higher-than-normal electricity bills caused by the compressor running constantly to overcome ice blockage
🔬 Diagnostic tip: Set your multimeter to Ω (resistance) mode and probe the two sensor terminals. A good sensor reads roughly 5–10 kΩ at room temperature. An open reading (OL / infinite resistance) confirms the internal thermal fuse has blown — replace the assembly. Always rule out a failed defrost heater (MEE62225112) first before condemning the sensor.
📦 What's in the Box
✅ 1× Defrost Control Assembly / Temperature Sensor (ACM73919214 compatible replacement) — pre-wired with OEM-style harness connector, ready to install
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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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