Was it really humid at the campground you were at? If you set the temperature too low too quickly, you will freeze up the unit and that will also cause the problems you saw. If you need to cool down to a lower temperature in very humid conditions, do it 2-3 degrees at a time. This will allow the unit to remove the humidity slowly and not freeze up.
You might want to invest in a Progressive Industries EMS unit. This will monitor the campground power and protect your motorhome from under and over voltages, open grounds, bad neutrals, and power surges. A quick peek at the unit, and you would have known your power status. If your voltage is too low, it would have shut down your connection before damage was done.
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Roger & Mary
2017 Winnebago Navion 24V
2014 Tiffin Phaeton 36GH (Sold)
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