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Refrigerator not defrosting

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Common solutions for: Refrigerator not defrosting
Solution 1:
Defrost Control Board
The defrost control board determines how often to run the defrost cycle. If the board fails, the refrigerator will not go into the defrost cycle. Before replacing the defrost control board, first test... the defrost heater and defrost thermostat. If the defrost heater and defrost thermostat are working properly, the defrost control board is likely defective.
Required Part
Refrigerator Defrost Control Board
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Solution 2:
Defrost Timer
The defrost timer turns on the defrost heater several times throughout the day to melt any frost that may have accumulated on the evaporator coils. If the defrost timer is defective, it may not advanc...e into the defrost cycle, or it may not send power to the defrost heater during the defrost cycle. To determine if the defrost timer is defective, slowly advance the dial into the defrost cycle. The compressor should turn off and the heater should turn on. If the timer does not send power to the defrost components or advance out of the defrost cycle within 30 minutes, this indicates that the defrost timer is not advancing. If the defrost timer is not advancing, replace it.
Required Part
Refrigerator Defrost Timer
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Solution 3:
Defrost 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.
Required Part
Refrigerator Defrost Heater Assembly
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Solution 4:
Defrost Sensor with Fuse
The defrost sensor monitors the temperature of the evaporator. The defrost sensor has a fuse to back up the sensor in case the sensor fails. If the defrost sensor fails to shut off the defrost heater,... the fuse will blow in order to shut off the defrost heater. If the defrost sensor fuse blows, the defrost system will not work, and the refrigerator will not defrost. The defrost sensor fuse is not resettable—if the defrost sensor fuse blows, you must replace the defrost sensor. To determine if the defrost sensor or fuse is defective, use a multimeter to test both the sensor and fuse for continuity. If either the defrost sensor or fuse does not have continuity, replace the defrost sensor.
Required Part
Refrigerator Defrost Sensor with Fuse
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Solution 5:
Defrost 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.
Required Part
Refrigerator Defrost Thermostat
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Solution 6:
Main 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 defros...t 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.
Required Part
Refrigerator Main Control Board
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