I can't remember what the dometic was like on my old diesel pusher, so no help for you on that. When I still had my norcold in the montana, I would use a plastic scraper to get rid of the ice in the freezer sections. Usually serious frost on the fridge fins means door seal is leaking air into the fridge.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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