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Sub Zero Refrigerator Defrost Drain Clogged

550

The part(s) or condition(s) listed below for the symptom Refrigerator defrost drain clogged 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 defrost drain clogged

Cause 1Clogged 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. If the defrost drain is frozen, thaw it out and ensure that the drain is clear of debris.

Cause 2Drain 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.

Parts
Drain Heater for your Sub ZeroRefrigerator
Drain Heater - Part # 753857 Mfg Part # 4201290

Refrigerator drain heater kit with instructions (611, 650, 511, 550, 2711, 2811)

Cause 3Drain 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.

Parts
Drain Heater for your Sub ZeroRefrigerator
Drain Heater - Part # 753861 Mfg Part # 4202160

Freezer drain heater kit with installation guide tube and instructions (611, 650, 511, 550)