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furnace help

hello all im new here with a ploblem, i have a armstrong ulta 80sx gas furnace, iv had 2 different companies here trying tio fix this BIG BOX,,here is whats going on the inducer motor runs, the igniter glows brite orange, next thing is sometimes lites sometimes dont, maybe 1 try to lite maybe 2 times maybe 3 here is the thing all new parts new sensor new igniter new Smartvalve, gas presure has been checked, last tech says sorry i have been here 3 times i dont know what else to do you are on your own:confused: HELP!!! PLEASE

Re: furnace help

If the flame lights and then goes out immediately, there is generally 3 common causes.
1- The flame sensor is dirty or defective.
2-The flame is not going all the way across the burner because it is dirty.
3- Your flue pipe is dumping into a large chimney and you are not getting the proper draft. You would need a flue liner installed the same size as the flue pipe going all the way up and out of the chimney.

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