Welcome to the forum! First check the drain holes are open and make sure all the extra mounting holes are caulked, but most likely you'll have to take the unit off and see if cold air is leaking back into the intake ducts and, if so, seal the problem and reset the unit.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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