Sorry I posted this, as I managed to fix it before anyone could reply...
I searched all the electrical panels, and found no circuit for the furnace?!..What? Then I remembered there is (used to be) a little fuse inside the thermostat itself. Took the cover off, and sure enough, there was a little slow-blo 2 amp in there. However it was fine?! It was very dusty, so I took out the fuse and dusted everything off, put it back in, and poof! The furnace worked! Just bad contact on the fuse in the thermostat itself. Easy fix if you ever find yourself with a totally unresponsive furnace.
2013 Winnebago 37F 38' (gas)
2020 Chevy Spark on the hitch
Full time since June, 2018.