RV Repair: LP Furnace problems, winnebago journey, furnace problems

Question
Not sure who to direct this to but, I saw a question answered here here that was similar to my problem.
Winnebago Journey 2002
Suburban SF 42 LP furnace,when switching to Gas Heat you can hear the electronic thermostat click and "another click calling for heat" yet the blower never comes on. What part (switch or wire)is the one that tells the blower to come on. My brother in law thinks it's the control board but I think the blower has to come on even before the control board comes into play.
where can I purchase this part? Suburban doesn't seem to help anyone but dealers.  

Answer
The board does control the fan in your furnace.
You can eliminate the thermostat by simply jumping the 2 wires at the Tstat or the 2 blue wires coming out of the furnace.
If it still doesn't work, verify the incoming voltage to be within tolerances stated in the owners manual or data plate. Usually between 10.8-13.8VDC is safe. Follow the wiring diagram on the furnace to find which wires are 12v+ and 12v-.
If voltage is good, take your board to a service shop to be tested, which you will likely find to be the issue.