Greetings from the Florida Panhandle
That's an odd one.
I would try turning the whole system off for a few moments and then back on. I would do this at the little switch on the bottom of the Duo-Therm
I would also check my 12 automotive fuses to make sure that the one that controls the furnace circuit has not blown or come out of place.
I would also open the furnace access door on the outside of the trailer and check to see if any wiring has come loose.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with HAHA
2005 Suburban 2500 Quadrasteer (Olivia) & 2011 Silverado 3500 (Fred) with Outfitter Truck Camper (Ethel)