I have a 25ft Jayco with a Atwood 8525 furnace. Last year in the mountains it was cold so we left the furnace on while we was for one day when we got back the batteries were down and the furnace was not working. After I got the generator fired up and batteries charged the furnace would not fire up. The fan would blow air through the vents but no heat. The only way I could get the fan to shut off was to turn it off right at the furnace. Just wondering what happen to the furnace after the batteries ran down. Anybody have any ideas?