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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.
The most challenging part in preventing water from leaking into your house is the sealing of your doors. The reasons are obvious. The door is a moving part and therefore a leaking source by nature. Once sealed it cannot be used until the flood is below your doorsteps.