NovaKool R4500 DC only is freezing food.

My first unit on my 2019 Cutwater C302c died last March. It stopped cooling and I worked with NovaKool tech support who told me that the compressor had a leak. Since dealers couldn't guarantee a fix and the cost was well over half a new fridge, I went with the later. The new unit, installed in April worked fine for a while. Then, one day it froze all the items in the fridge including causing several soda cans to explode. I called the dealer, but, before we could schedule, I turned the setting from 3 to 1 and after two days, I checked the temperature (at setting one) and it was 37° with no major icing. I moved the control back to setting number three to see if it's going to perform normally and it ran with no major icing...until now. It has been at three since April and I again got major icing, albeit, no explosions. I checked the temp. and it was 26 degrees. I'm planning to call Tech Support on Monday, but, thought I'd check if anyone had wildly fluctuating temperature. Note, I have treated it very well keeping the freezer door closed, defrosted and lightly loaded compartment. While these units used to be reasonably priced, they now list for close to $2K, like the price of a large home quality refrigerator.

Hey Rocky. Have you noticed what the cabin temps are when it freezes? I've learned that if I'm going to leave the AC on, I have to turn the dial to cooler to keep temp correct. If I cut the AC on and the cabin gets cool and I forget to set it back to normal I will get frozen stuff in the fridge. On my 27 the fridge is installed with no visible ventilation like the manual would recommend, which only compounds the problem

Ambient temperature may be a factor, thanks for pointing that out. In Half Moon Bay, the temperatures are usually 50-70 degrees, much cooler than inland. We may have had a few especially cool days that triggered the freeze. I think it's safe to say that our NovaKools are pretty primitive in general. Sadly, they are not cheap like they used to be, I've seen the price double.