Hmmm...the furnace operates only on 12v whether or not you're plugged into a 120v supply. When plugged into shore power the converter is providing maximum output, ~13.6v to charge your batteries and run the coach. If the furnace isn't working when disconnected from shore power then I would look into how many volts your batteries are providing. They should be tested and possibly replaced.
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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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