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Do you have the make and model of your furnace? And the make and style of the thermostat? That would help me be able to direct you further and supply the correct manual for you that we would use here.
All follow ups are included and expected. I will also make a phone chat option offer for you as many of our customers prefer that as it can save time and some say it is easier to follow along.
Is the thermostat an analog slide control or digital? The furnace has a 15 amp fuse in your load center and it has a 5 amp breaker in the furnace IF you have an outside inspection panel. Do you have a 12 VDC test light as that is very helpful here for tracking this down. And I am attaching a link to the Atwood Furnace Service Manual for you. Print out a copy so you have it. Great stuff in there and it shows you the 5 amp breaker which is in the lower left hand corner when you open up the inspection panel (if you have that option) Let me know. We can go from there............http://bryantrv.com/docs2/docs/hflamefurn04.pdf
The thermostat should have a fuse as well once you remove the cover. A small digital multimeter is best for checking fuses when set on Ohms.
Just checking back to see if you need more on this from me or did you get it resolved?