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It will work with the cover off, you just touch the post just like you would with the cover on. These CT thermostats are notorious for malfunctioning. The buttons are meant to just touch to make changes but they are so sensitive we all tend to push them just a little too much and the foam contacts underneath compress to where you really get some bazar issues like just walking past it and the temp running up to 90. Take the covers off and all goes back to normal. Dometic will supply new covers at no cast but the underlying issue remains.
Your issue sounds like it may just need some cleaning around the sail switch. Does it give heat when on high or just the fan?
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Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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