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Refrigerator defrost drain clogged

01 - Refrigerator Fan Motor
If the refrigerator's defrost drain is clogged, it's possible the evaporator fan motor is not working. If the evaporator fan is not running, cold air from the evaporator can migrate to the defrost drain causing ice buildup in the drain. To determine if the evaporator fan motor is defective, try turning the fan blade by hand. If the fan blade does not turn freely, replace the fan motor. Additionally, if the motor is unusually noisy, replace it. Finally, if the motor does not run at all, use a mul...timeter to test the motor windings for continuity. If the windings do not have continuity, replace the evaporator fan motor.
Required Part
Refrigerator Fan Motor
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Most Common Solution
02 - Clogged or Freezing Defrost Drain
The defrost drain might be clogged or frozen. If the defrost drain is frozen, the water will overflow the drain trough and drip down to the bottom of the compartment. You can use a turkey baster and warm water to help clear out a frozen defrost drain and tube. You should also make sure the drain tube trap is clear by the drain pan.
03 - Refrigerator Drain Strap
Some defrost drains are outfitted with a drain strap. The drain strap is a small piece of copper or aluminum that attaches to the defrost heater and extends partway into the defrost drain. When the defrost heater turns on, heat is conducted through the drain strap to melt away any ice that may have accumulated further down in the defrost drain. If the drain strap is not in place, the defrost drain may be more likely to freeze over.
Required Part
Refrigerator Drain Strap
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Most Common Solution
04 - Refrigerator Evaporator Fan Motor
If the evaporator fan motor stops running, the temperature of the air, especially at the bottom of the evaporator coil, can drop well below zero degrees Fahrenheit. This can cause any water from the defrost cycle to freeze quickly and possibly clog the drain with ice. You can try turning the evaporator fan motor blade by hand to see if it rotates freely. If not, it's likely the fan motor bearings have seized. You can also use a multimeter to test the evaporator fan motor for electrical continuit...y. If the component tests negative for continuity, you'll know the part is defective and requires replacement.
Required Part
Refrigerator Evaporator Fan Motor
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Most Common Solution
05 - Refrigerator Drain Heater
Some refrigerators are equipped with drain heaters. Drain heaters prevent the water in the drain pan from re-freezing and clogging the defrost drain. If your drain heater is defective or is not in the proper position, the defrost drain might freeze over.
Required Part
Refrigerator Drain Heater
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Most Common Solution