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 ...
Check voltages. When my fridge is running from my generator which is running at 120-122 VAC, I notice no cooling differences between that and propane. However, I would guess that if voltage is at 110-115VAC, then LP gas would win out.
I use gas mainly, but it doesn't hurt to swap between the two.
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