RV furnace doesn’t turn back on February 20, 2025 at 11:55 am #42531 Tory JonKeymaster Joined: Nov 2019 Posts: 612 Likes: 860 LikeUp4:: I would assume if its the sail switch it wouldn’t start in the first place. I’d guess the control board needs to be replaced. If it’s still under warranty I’d take it to the dealer and have them replace it.