As Mmcglynn said, if you have a newer Dometic unit then you have the one with the digital communications and therefore you can't just replace the thermostat with a household model.
You can replace it, but you also have to replace the control box in the A/C and run new thermostat cable, which is usually the hardest part, because of how it's ran in and around stuff in the walls and ceiling.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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