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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.
It is not common, but occasionally the drain pan at the bottom of the refrigerator can develop a crack that allows water to leak. It is normal for a small amount of water to accumulate in the drain pan, but it is not normal for it to escape the pan.