did you by pass the thermal switch?
I had the same issue with everyone saying "sail switch" just as you my furnace went on to the next step of igniting for 5-20 seconds then shutting down. board was not getting signal of heat and shut the gas off. good luck and please post what the issue was once it fixed.
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2016 Ram 3500 DRW pulling 2016 Montana 3720RL
living in UT. wandering around with my best friend (38) years married and the royals (2 Saint Bernard's)
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