Trane XR95 problems.

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The first problem is a pressure switch error. I cleaned everything. If l disconnect the air intake, it clears. My air intake is not blocked. If I leave the air intake hooked up and disconnect the the black hose That goes to the gas valve and fire box, it also clears. The second problem is once it clears, it won't light. It does 3 cycles and locks out. Glow plug glows bright.. Not getting voltage to the gas valve. All limit switches are good. Is it all related? Worked great last year, went to fire it up before heating season. Glad we did.
 

kok328

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Can you interpret the trouble code blinking on the control board referencing the legends on the back of the removable panel?
 

kok328

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possibly a birds nest in the exhaust pipe?
 
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Pressure valve started working when HVAC showed up. He is putting in new gas valve. It is stuck. When pressure switch screws up again, I will replace it.
 
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