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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22634
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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Call igniter glows gas valve kicks on gas ignites but does

Customer Question

Customer: Call for heat igniter glows gas valve kicks on gas ignites but does not make it to all of the tubes and does not make it to the flame sensor
JA: Thanks. Can you give me any more details about your issue?
Customer: Trane unit XR90 shows 2 flashes for lockout I have changed the flame sensor because that is what I have found to fail most of the time. I watch it from the small glass window everything seems to work up to the burners only seem to make it half way down the tube and does not reach the flame sensors sometimes I can get it to work on the third try
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Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.

Hello, the flame sensor cannot work unless flame gets to our issue is the flame pattern. Your burner wings/crossover is partially plugged and needs to be cleaned out. There are small grooves in the sides of the burners that spread the flame burner to burner.

The best thing is to remove all burners and clean and reinstall.