If you try everything else and can't find the problem, replace the sail switch. Even though sail switches aren't supposed to cause the problems some of us have been having replacing the sail switch has fixed a wide variety of problems. Dometic had a bunch of bad ones and knows it but isn't issueing a recall or even a service bulletin. You can't call and get anyone who knows about it, but when our mobile tech called, the real service people, they told him right off.
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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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