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Refrigerator Not Defrosting

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The part(s) or condition(s) listed below for the symptom Refrigerator not defrosting are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Refrigerator not defrosting

Cause 1Defrost Heater Assembly

The defrost heater assembly turns on several times throughout the day to melt away any frost that may have accumulated on the evaporator coils. If the defrost heater assembly is defective, the defrost system will not work, and frost will continue to accumulate on the evaporator coils. To determine if the defrost heater is defective, use a multimeter to test it for continuity. If the defrost heater does not have continuity, replace it.

Part Testing
Parts
Defrost Heater Assembly for your Refrigerator
Defrost Heater Assembly - Part # 914088 Mfg Part # WR51X10055

Refrigerator defrost heater and bracket assembly.

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Cause 2Main Control Board

The main control board regulates the power supply to all of the refrigerator components, including the defrost system. If the main control board is defective, it may stop sending voltage to the defrost system. Control boards are frequently misdiagnosed—before replacing the main control, first test all of the defrost system components. If none of the defrost system components are defective, consider replacing the main control board.

Parts
Main Control Board for your Refrigerator
Main Control Board - Part # 1531075 Mfg Part # WR55X10942

Refrigerator main control board assembly with installation instructions. This board also has the defrost controls built into it.

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