this happened to my dual unit. We defrosted the inside and it turned
out the motor was frozen in about 3 inches of ice. When we defrosted
it, we onlt watched the ice inside the freezer melt, we did not give
enough time for the ice BEHIND the freezer to melt. I would suggest
defrosting it for 1-2 days and letting all the ice melt, inside and
out, and see if that helps.