Even though it sometimes does eventually light I would still pull and clean the sail switch. There could be just enough lint to prevent ignition some of the time but the persistence of the fan could occasionally get the contact it needs for it to ignite. It's a possibility. I would start there. It doesn't hurt to have an extra one on hand just in case.
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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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