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Frost and ice accumulate on the evaporator coils because the defrost heater fails to energize during the automatic defrost cycle, eventually blocking all airflow.
When the evaporator coils ice over completely, cold air cannot circulate into the freezer compartment, causing temperatures to rise above the set point.
Restricted airflow from iced-over evaporator coils prevents cold air from reaching the fresh food section, resulting in inadequate refrigerator cooling.
The compressor runs non-stop trying to compensate for poor cooling caused by frost-blocked coils when the defrost heater is no longer functioning.
Visible heavy frost or ice sheet on the back wall or floor of the freezer compartment is a direct symptom of a failed defrost heater assembly.
💡 Pro Tip: Is Your Defrost Heater Failing?
Your part is likely the culprit if you notice any of the following:
⚠️ Heavy frost or ice buildup on the rear panel or floor inside the freezer compartment
⚠️ Freezer section is too warm or not maintaining set temperature
⚠️ Refrigerator runs continuously without cycling off
⚠️ Fridge compartment too warm due to blocked airflow from iced-over evaporator coils
🔍 Diagnostic Tip: Set your multimeter to continuity (Ω) mode and probe both heater leads. A good heater shows continuity (~18.7 Ω resistance); an open circuit (no continuity) confirms the heater is faulty and must be replaced. Always unplug the refrigerator before testing.
📦 What's in the Box
✅ 1× Dual Quartz Glass Tube Defrost Heater Set (2 tubes × 10-1/2" with metal shields, 115V / 772W)
✅ 1× Pre-wired wiring harness with plug-in connectors
✅ 1× Clip-on Defrost Termination Thermostat (L60-30°F, replaces WR50X122)
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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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