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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.
Water pooling at the bottom of your refrigerator or inside or underneath your vegetable crisper drawers is usually caused by a blocked or clogged defrost drain or tube. Food debris and ice can block the line, parts that are part of the line (such as valves, etc.), collection cup or the defrost drain, causing water to flow into or out of the fridge.