Atwood furnace not igniting

I find it very funny when people suggest to just blow out a sail switch. I have NEVER found a sail switch that has dust or debris causing it to not work. Maybe it happens but I have worked on thousands of furnaces in 40 years. Also, the odds are since the OP has a smaller Jayco, the furnace will have to be PULLED to do ANY diag or cleaning. Jayco has been putting Zero Clearance Furnaces in for the past 10 years. On new Furnaces, IF the Sail switch is malfunctioning, it can cause failure of ignition cycle IF IT STAYS CLOSED after original heating operation. Older Module boards did not have this type failure. This means, that IF when the furnace is started, and it sees the current is already flowing thru a stuck ON sail switch, before the Fan gets to speed, it will shut down the ignition cycle. So, with zero clearance Furnaces, it is best to replace the sail switch anytime you have to pull the complete furnace. Small cost($10 to $25) for making sure if you have a intermittent sail switch, you don't have to keep pulling the furnace. With a new sail switch, you then go thru a complete check out of the furnace. Doug