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I will ignore all sail switch comments as you are not listening or don't understand how the furnace works.
So I tried something. Turned the gas regulator down as far as I could, got down to 6-1/2" of water. Low and behold at that pressure the furnace lit and work fine. While it was running I turned the pressure back up to 11". Expected the flame to go out as it got more gas but it never did. The exhaust coming out was really hot, as in it would burn you pretty quick if you put you hand near it. I sut it down to see if it would start again and it did! Maybe because it was hot, I don't know. I will let it cool down and see what happens. All I know is it starts on lower pressure which kinda confirms my thoughts that the gas valve in the furnace also lowers the pressure, mine does not right now.
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