I also am having cooling issues with my Dometic RM3862. Is it typical for these to operate better on AC than on LP? Like a previous poster, the freezer seems to be cold enough, but the refrigerator ...
I've found that on hot days, my refrig will cool really well. On cool days, not so much - still works, but doesn't seem as cold. Since it does what we need it to do, I haven't put any effort into seeing if I can change that.
I have not found that much of a difference between gas or electric, but we are just weekenders so I've not done any long term use.
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