We have a Jayco Jay Flight slx tt. The atwood furnace quit igniting on our last camping trip. The fan (blower) will come on and run for 30 seconds and shut off, (no ignition no heat). Propane tank full, batteries charged, connected to land power but still no change.Any thoughts are welcomeThx

Can you pull the control board out and take it to an RV shop to get tested? Sounds like the same issue that I had last year with my Atwood furnace. Ended up being the control board was done. It’s easy to take it out.Good YouTube video: Here

Dirty sail switch! Blow out sail switch with compressed air.

enblethen wrote:Dirty sail switch! Blow out sail switch with compressed air.Or dirty fan.

See my comments in your other post earlier. YouTube video link there explaining how to remove the Sail Switch. Start by blowing out the furnace compartment with a blower to get loose dirt and dead bugs out. Flip the reset button. It should fire until it faults again. Once it faults, check the red flashing light on the furnace board. See the codes I put in the other thread you started. Depending on the type of flash will determine the problem. Sail Switch is very easy to get to and cleaning off lint and dust will probably let it work again. Reassemble, flip the reset switch again, and see if it cycles correct. If it does, replace cover and enjoy the heat!FYI, when I did mine at 11:30 pm last night, I did not unplug power or disconnect batteries. Just handle carefully and don't touch any ends of wires.

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

Atwood furnace not igniting | Good Sam Community

3_tons
Explorer III
Dec 20, 2019
I had a similar problem, and after examination it was not the sail switch... Turned out that theres an ignition prover (not sure if thats the proper OEM name) just above the exhaust outlet that has two electrode prongs, that over a time the gap can get outta spec due to road vibration... I pulled this out and closed the gap a bit (to about 1/4”) and all was well again... Haven't had a single recurrence in over 5 years since...
vermilye
Explorer
Dec 20, 2019
Mike63376 wrote:
Got the same sail switch problem. 2019 jayco. Atwood furnace gas valve won’t open. Shut it down. Removed cover (no door). Tapped on sail switch lightly. Reset and powered thermostat. Works fine for about 3 weeks. Just happened again. Do I have to remove the whole furnace to change sail switch. It has the new design. Bought another new furnace. It has the old design sail switch. What’s the problem with the sail switch. Jayco is new. New sail switch is located in blower outlet housing, old style is in combustion blower housing. Why the change in locations?
One sail switch problem many Escape Fiberglass trailer owners have been having with the Atwood AFSAD12 furnace is pet hair jamming the switch. Rather than replacing it, carefully removing the accumulation has fixed it.

The newer installations include an outside door that provides access to both the electronics & sail switch. Older models require pulling the furnace for either.

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