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A blocked defrost drain is one of the most common causes of water leaking from your refrigerator and is a good place to start troubleshooting. The small drain opening is easily blocked by food particles or ice, preventing water that accumulated during the defrost cycle from draining to the pan.
Determining Why a Refrigerator Leaks. 1  1. Check the drain pan and tube. Water pooled outside the refrigerator might be caused by a dirty drain pan. 2  2. Level the refrigerator. If your refrigerator is not level, things might not seal correctly, and the defrost drain might leak. 3  3. Check the water filter.