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Whirlpool 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 WhirlpoolRefrigerator
Defrost Heater Assembly - Part # 1408375 Mfg Part # WP2323198
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Cause 2Defrost Thermostat

The defrost thermostat monitors the temperature of the evaporator coils. When the coils drop below a set temperature, the thermostat contacts close to allow power to flow to the defrost heater during the defrost cycle. In the defrost cycle, the defrost heater melts away any frost that may have accumulated on the evaporator coils. If the defrost thermostat is defective, the thermostat contacts will not close. As a result, the thermostat won’t provide power to the defrost heater. To determine if the defrost thermostat is defective, use a multimeter to test it for continuity. If the defrost thermostat does not have continuity when it reaches the low temperature of its operating range, replace it.

Parts
Defrost Thermostat for your WhirlpoolRefrigerator
Defrost Thermostat - Part # 1872722 Mfg Part # WPW10225581

Refrigerator defrost thermostat. The thermostat clips onto the evaporator. If the refrigerator does not defrost both the thermostat and heater can be tested to determine which part is at fault.

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