What kind of access do you have to the furnace? If there is an exterior access plate then checking/cleaning the sail switch if pretty easy. They rarely go bad but it's possible. It's more common for some lint to get blown between the contacts.
Also, sometimes just wiggling the various wire connections can improve contact to the main board. I just had that happen on our trailer, and also had it happen on previous trailers. I thought it might be a dirty sail switch...it wasn't. But after pulling the main board to check for shorts, I reinstalled it and it worked again.
PS...welcome aboard! I hope you stick around.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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