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Furnace code light flashes 3 times /pressure switch stuck open

I try to turn on my furnace and i get a flashing code
furnace wont turn on / pressure switch stuck open what should i do

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  • Anonymous Jan 19, 2009

    i have the same problem

  • Anonymous Jan 20, 2009

    Hey I had same problem with my funace this morning. First I checked pressure switch by pulling hose of and softly suckin to listen for click. Mine was fine, the purge motor was operating like it was supposed to ( the little motor that removes gases from furnace chamber) . Next thing I checked was the problem. The air intake plumbing had ice and snow blocking it. I cleaned it out and the problem was solved. My furnace is a 90+ effeciency so the intake and exhaust plumbing is easy to follow out and is within reach. Hope this helps.

  • gazzer69 Apr 05, 2009

    My furnace will not turn on. I can hear the draft fan running and there is negative pressure at the intake pipe and positve pressure outside. I am getting a flash code of 3 but both pressure sensors where checkedto be okay using a DVOM. After a shut down of the furnace's power I can hear the draft fan start up and the HSI heats to a bright orange but about 7 seconds later the HSI goes out and the flash code 3 returns. What I am missing here? Please help.



    Garry

  • Anonymous Mar 16, 2014

    Ducane furnace code lite 3

  • Anonymous Mar 16, 2014

    Cleared out a code 3 but now have constant flashing CODE call for heat????

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Check the intake and exhaust plumbing for any obstructions. I had same issue, turned out to be ice in the air intake plumbing on outside of house. This may be the problem. The pressure switch can be tested by pulling hose from purge motor that goes to switch and applying a small amount of suction. The switch should make a clicking sound.

Posted on Jan 20, 2009

  • Rob Sloan
    Rob Sloan Mar 16, 2014

    I got the clicking sound and took advice but the 3 lite code stopped now I have a constant flashing code says fast heartbeat call for heat????HELP PLEASE!!!

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3 Flashes means pressure switch malfunction......had the same 3 flashes and when i changed the pressure switch all was well and good.
Alan
Terrace BC

Posted on Jan 15, 2010

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