GE side by side with freezer that won't defrost
We have a GE (model #GSH25JSTA SS) side by side that is three years old. The frost keeps building up in the freezer, which then makes the fridge side warm. A tech came out and pulled the back of the freezer off to reveal loads of frost all over the defrost coils. He replaced our main control board because everything else checked out fine. That was pricey. Two weeks later, same story. He came back out and replaced some wires. Two weeks later, same story. The deforst Bi-metal is good and the Defrost metal checks out fine as well. What is wrong with this freezer? Does anyone have any advice or has had a similar problem? Suggestion? Help? Thanks!