Ice in the refrigerator is caused by moisture condensing and freezing on the interior. In normal use, the doors are opened and closed dozens of times a day allowing moist air to enter. Add warm/room temperature items, more humidity.
Bring it to the dealer with the fridge empty, they start it up, leave the door closed for a week and then look inside; no ice.
You are experiencing something pretty normal for an unvented 12v refrigerator. We turn our gas/electric fridge on in April and it runs non-stop until November. The fridge defrosts regularly and drains condensate out the exterior wall vent. The freezer has quite an ice build up by the end of the season, but nothing alarming.
As for the water heater, what Chuckster said.
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Rob & Amy
2019 Passport 240BH SL (current)
2024 Cougar 29BHL (on order, due early May)
2022 Ford F250 7.3L Godzilla Crew Cab 4x4
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