We bought the Commercial Freezer T-23F last month and the unit never works right, we had a service persons came in to fix it two time, both time they fix the defrost timer and it still the same. The temperature always stay at 20* - 30* F, it works like a refrigerator. Two day ago. they replaced us with the same unit (new) and still the same problem ( temperature always stay at 20* - 30* F). This time, I momitor this replaced unit for 8 hours and notice that the defrost timer work two times and again still the same problem. Please help.