Removed two metal panels and icemaker from inside the back of the freezer compartment and found the air circulation fan was not running. I ordered and replaced the fan motor to no avail (compressor still ran fine and lines were very cold but air circulation motor would not run). I unplugged the two thermistors one at a time and each time the digital control panel indicated an error indicating to me the thermistors were fine. Only one part remaining that could be the source of my problem..... the digital control panel itself which several websites said hardly ever failed. So I took the plunge ordering a new digital control panel. After replacing it everything went to working perfectly. We are very happy that we could repair our 4 year old side-by-side refridgerator/freezer ourselves.