I’d have a look see at the various ducts coming off the furnace and insect for kinks, etc. if air flow is impeded too much it will cause the Hi limit switch to open thus killing furnace operation. I doubt sail switch has anything tondo with this issue.
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2007 GMC Classic club cab 4x4 Duramax LBZ
2014 Alpine 3010 RE. 34 foot fifth wheel
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