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There is a drain hose from the freezer to the pan. Get to the back of the fridge, remove the panel, and you can see a white plastic drain tube. If you can remove it, those tubes can get blocked easily and often. When the tube gets blocked, it will eventually close smaller and smaller, not allowing water to drain. Then causing massive ice build-up. Also, please check the door seals. If warm outside air enters, it will cause this as well.
