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Armstrong air tech 91 furnace problem

I have a light that is flashing three times which indicates that the pressure switch is open and should be closed. how do i close it?

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  • bvn2002 Jan 22, 2009

    I had the same problem

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Sounds like the flue is plugged, I had same problem and opened up the draft fan and there was a dead bird restricting the flue. Furnace will never light if the pressure switch never closes as you have found out. Also has anyone moved the switch some are position sensitive meaning have to be in same position factory set the switch. I had one like that also switch was little crooked so I straighten it up and walla worked.

Posted on Nov 23, 2008

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