No heat, Trane xe 80, already ruled things out, very confused, please help!!

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seigi009

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So my heat is out on my TRANE XE 80 TUD080C948J1. I get 3 flashes from the LED. There is a call for heat from the thermostat. The inducer motor turns on and it spins smoothly when I turn it by hand. I replaced the pressure switch, ignitor and flame sensor. One time I saw the new ignitor light up, but only once. I don't have anything blocking the exhaust and I checked the rubber tube runnng from the pressure switch to the inducer. there are no clogs there. All this and I still get 3 flashes and no heat. what am I missing? bad board? Gas valve? Any thoughts? thank you.
 
Mine went out last year on Thanksgiving Day and it was a leak in the tube to the pressure switch. The end had dried out and was blowing air but not quite enough to set the switch. Tapping around is how I found it as it would light if I tapped it.

Sounds like you have checked all the main things.

Pros will be along shortly to help I hope.
 
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