Just for fun I would be temped to take the furnace out of the mix to see if you can get the heat pump to engage. You can turn it off at the control board or pull the fuse. That might tell you something. Also, which thermostat do you have? Some of the Dometics can be finiky or glitchy.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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