I removed to the cover to the coil, defrosted coil with a heat gun and checked the heater strip resistance. I set timer to defrost by hand to make sure everything was working. There was damage to the temp control sensor. Both parts were on your web site at a good price, ordering was easy. The parts were in the mail two days later. A screwdriver and nut driver were the only other tools other than a multi meter. Parts installed in five min. I had the option of talking with a pro !!!