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Freezer evaporator coils accumulate heavy frost or ice that does not melt automatically between cycles, blocking airflow and reducing cooling efficiency.
Ice-blocked air vents caused by a failed defrost heater restrict cold air circulation, causing both compartments to run above target temperature.
With defrost disabled, the refrigerator works overtime trying to maintain temperature, causing the compressor to run non-stop or cycle abnormally often.
Manually melting ice offers only temporary relief; without a working heater element, frost rebuilds on the evaporator within a few days.
💡 Pro Tip: Diagnosing a Failed Defrost Heater
Your part is likely the culprit if you notice any of the following:
⚠️ Heavy frost or ice buildup on the evaporator coils or freezer back wall
⚠️ Refrigerator or freezer section running warmer than usual due to ice-blocked air vents
⚠️ Compressor running constantly or cycling more frequently than normal
⚠️ Frost reappears within days of manually defrosting the freezer
Use a multimeter set to Rx1 to test the heater for continuity. A reading of no continuity (open circuit) confirms the element is burned out. Also test the defrost thermostat WR50X10068 and thermistor WR55X10025 at the same time — all three parts work together and one failed component can mask another.
📦 What's in the Box
✅ 1× Dual-Tube Quartz Defrost Heater with Mounting Bracket (9" / 110V, WR51X10101)
✅ 1× Wire harness adapter / extension lead (~22" for single-to-dual wiring conversion)
✅ 1× White jumper wire for left-side bracket terminal
We typically respond within 1 business day. Include your appliance model number for the fastest answer.
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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