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This is a very common issue and it means that your defrost drain line has frozen over and will need to be thawed out. This often times happens for no reason at all and is just random. You will need to remove everything out of your freezer and remove the lower back vented panel inside the freezer. Use a hair dryer to thaw all the ice out and locate the drain hole. Pour hot water down the drain hole until it's draining properly again. Once it's draining properly blow compressed air down to make sure it's clear. If you don't have compressed air, use a turkey baster to make sure the drain line is clear and draining properly. Then just put everything back together and you should be good to go again.
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