Some designs are simply prone to the drain tube freezing up. I had an Amana deep freeze that did this chronically, and the manufacturer admitted that it was a fault of design; they had come up with a retrofit heater wire for the drain tube to keep it from freezing up during the defrost cycle.
Have a look at the drain tube. It should be kept spotlessly clean because dirt & debris promote freezing. You can also spray silicone spray into it.
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Anson & Donna
Be kind whenever possible. It is always possible. ~The Dalai Lama
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