Last time we used our motorhome, all the furnaces and everything works perfect. Getting ready to take off for Mobile Alabama from South Dakota ,and it's cold. Turn down the back furnace and the fan ran for a little bit and shut down ,now nothing works. I really can't find the breaker or fuse for it so I'm at a loss. thanks for anybody's help. Randy.
Remove the outside cover and check for 12 volts. There is a breaker in there. I think there is also a fuse at the foot of the bed. If not there check also behind the white panel in the basement.
the Atwood shop manual has a good trouble shooting section. Find your furnace model, see the relevant electrical diagrams, run the trouble shooting steps.
If you decide you need a new printed circuit board, we recommend the Dinosaur brand over factory offering.
https://myrvworks.com/wp-content/uploads/2019/04/Atwood-Shop-Manual-HydroFlame.pdf
Ignitor Board Index page (https://www.dinosaurelectronics.com/Ignitor_boards.htm)
Thank you very much. I'll try that tomorrow.
On our 1992 U225 the rear furnace is on the passenger side behind a chest of drawers with an air intake grill at floor level. If yours is similar you can remove that grill and turn the blower wheel by hand to see if it's mechanically free or not.
I carry a spare dinosaur replacement board, sail switch, limit switch, and just replaced the blower motors. Of all the appliances I have had the most trouble with over the years it is these furnaces. I have been left without heat because of all the above parts at one point or another. Easy to diagnose, most are an easy to fix. Like Chuck and Jeanie said, look up the troubleshooting steps. It is very step 1,2,3 with these for firing order of operation.