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2012 Samsung refrigerator freezer french door fridge pull out bottom freezer bought used. Have had it for less than a year. Freezer stopped freezing and there is a error code (21 E) and (39E). What could be wrong that we can perhaps fix?

I have the same issue, my freezer is not code enough but my fridge works just fine. I set my fridge at 35F & freezer at -2F