At first, I suspected the evaporator fan motor was going bad, but when I went in to check it out, I found the evaporator coils totally frozen up; the fan was cavitating. I defrosted the coils completely and checked everything out. By process of elimination the Defrost timer had to be the culprit. I unplugged the timer and sure enough, the motor winding was open. Replacing the defrost timer fixed my problem. Troubleshooting (using the information available on your web site) took a little under an hour; replacing the part took less than 15 minutes start to finish. Unloading the freezer, and de-icing the coils for troubleshooting was the longest process. Part delivery was fast... 2 days. So, using our deep freeze and a cooler, the evolution was fairly painless.