A HUMMING NOISE, FREEZER IS ICING UP, STAYING AT CAMP GROUND ALL SUMMER AS HOST,WHY IS IT NOSEY AND HEAVY FROST
SOURCE: New Dometic rooftop Unit runs
Couple of things can make a rooftop loud. Being installed with out the proper gasket in between the unit and the roof, not using the rubber washers on the bolts, or the bolts being to loose. Next, could be the fan hitting the shroud, this can be from improper mounting of the unit, one side tighter than the other, causing the unit to warp to one side. Or just the fan being mounted off side to start with. Now, if the fan on top is not positioned just so, and not pulling air across the condenser coil right, that can cause it not to cool as well as it should. If mine and I was on a trip, and could not get it back to the installer. I would get on top and remove the cover and check the fan. I would check the bolts and gasket under the mount. Ask around the camp site for someone with the skills to check the freon level. Always someone knows enough to fix their own. Then once back in town take it back for a recheck by the installer, getting him to straighten out anything you and your new camp site buddy find wrong. Hope this helps Fix Ya up.
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