Karl B
Chuck S is all over it, as in he absolutely understands this unit. The only other couple of things I could think of, because I recently pulled my furnace and repaired it myself because two dealers could not, is the main board in the furnace itself could be bad or the "sail switch", (air proving switch).
A good site on You Tube is "My RV Works" The gentleman who does these videos on RV furnaces is an excellent RV mechanic and he really helps you understand the inner workings of the furnace system, and many other RV systems.
The trouble I found was it takes a lot of time, some test instruments, and a good understanding of the system. I have an HVAC background which helped tremendously.
Good Luck - They can be be frustrating
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