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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.
If your refrigerator has a built-in water dispenser in the door, a leak in the dispenser system could be the cause of the water pool. This may be difficult to diagnose and repair without the help of a professional repairman, because the water tubes generally are inside the walls of the refrigerator.