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Armstrong ultra sx 80 furnace starts up and runs and then the gas shuts off for a few seconds and then lights backup and causes a small backfire

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  • Anonymous Apr 06, 2009

    I Have an Ultra SX 80 Furnace mine will cut on and immediately right back off

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Flame sensor could be dirty. It is located right beside the last burner looks like a thick piece of wire. Take steel wool and gently clean the probe 4 or 5 strokes is all it will take to take off the carbon build up off. Lets eliminate this item and see if it clears up okay. ken

Posted on Dec 21, 2008

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TRUE.

Posted on Dec 02, 2009

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SOURCE: armstrong ultra sx 80 furnace

You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.

Let me know how it goes ken

Posted on Apr 15, 2009

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Armstrong ultra sx 80 furnace starts up and runs and then the gas shuts off for a few seconds and then lights backup and causes a small backfire my Ultra sx 80 furnace will ignite then immediately turn...


You have a dirty flame sensor. Look at the very last burner and you will see a wire going to a ceramic sensor and it looks like a thick wire. Take some steel wool or fine sandpaper and clean the surface off and it will work like a champ.

Let me know how it goes ken

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