My guess . . . the coach batteries have discharged to a level insufficient for the operation of the propane furnace. The furnace control circuitry and the fan motor run on 12 volts which is provided by the coach batteries (when the engine isn't running and you aren't plugged into shore power)
If your engine is running, the alternator will work to recharge the coach batteries, also if you are plugged into shore power, your converter will work to recharge the coach batteries. At the same time either the engine is running or you are plugged into shore power, there will be 12 volts to run the furnace properly even if the coach batteries aren't finished charging.
Congrats on your new rig, by the way. Have fun!
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Warren and Debbie, Deep in The Heart of Texas
2018 Winnebago View 24D
2014 Tiffin Breeze 32BR, 2012 Winnebago Navion 24G, 2006 Winnebago View 23H
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