I had a Monaco with one of those thermostats once. From time to time it would display the symptoms you describe. Finally figured out that because the thermostat was mounted on an outside wall, when conditions were just right, I would get condensation on the back of and inside the thermostat that caused the erratic behavior. Removed and remounted on and inside wall and never had the problem again.
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2023 Grand Design 2600RB, 2022 F-350 King Ranch tow vehicle, Titusville, FL when not on the road
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