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-   -   "pressure switch open with inducer on? (https://www.askmehelpdesk.com/showthread.php?t=290817)

  • Dec 10, 2008, 09:04 PM
    hvacservicetech_07

    Gas valve on,fan switch auto and blower door must be on.
  • Dec 10, 2008, 09:05 PM
    hvacservicetech_07
    You can leave the top door off,just to see if it's going to light. Do you hear water slushing in the inducer?
  • Dec 10, 2008, 09:10 PM
    JJOHNSON27

    No water. But when I remove small grey tube from gas regulator, plug with my finger, the light turns solid red for about 6 seconds, then goes back to flashing twice.
    Is there a way to tell if propane is getting to the furnace, its on at the pig, but...
  • Dec 10, 2008, 09:11 PM
    hvacservicetech_07

    Does the ignitor ever glow?
  • Dec 10, 2008, 09:12 PM
    JJOHNSON27

    No glow
  • Dec 10, 2008, 09:13 PM
    hvacservicetech_07

    Ok,locate the pressure switch,do you see the rubber tube that is connected to the pressure switch?
  • Dec 10, 2008, 09:16 PM
    JJOHNSON27

    2 actually. Small & grey. One in front of the other. One goes to inducer motor & the other splits and goes to the box where u can see the flame and the gas valve
  • Dec 10, 2008, 09:18 PM
    hvacservicetech_07

    OK,the tube that goes to the inducer motor hooks to the pressure switch on the other end.
  • Dec 10, 2008, 09:19 PM
    JJOHNSON27

    Yes
  • Dec 10, 2008, 09:20 PM
    hvacservicetech_07
    Shut furnace off,remove tube from inducer only,power furnace and suck on the tube like a straw,you will hear a click keep sucking keeping a vacum on the tube until you see an ignitor glow.
  • Dec 10, 2008, 09:22 PM
    hvacservicetech_07
    Your furnace should have a plastic exaust pipe,does it vent through the roof or the side of the house?
  • Dec 10, 2008, 09:24 PM
    JJOHNSON27

    Did that, it glowed, then when I stopped, it stopped glowing
  • Dec 10, 2008, 09:25 PM
    JJOHNSON27

    Roof
  • Dec 10, 2008, 09:25 PM
    hvacservicetech_07


    Ok, two pipes?
  • Dec 10, 2008, 09:27 PM
    JJOHNSON27

    Two pipes go up through roof
  • Dec 10, 2008, 09:28 PM
    hvacservicetech_07

    How cold is it outside?
  • Dec 10, 2008, 09:29 PM
    JJOHNSON27

    19 degrees. And we just got DUMPED on with snow over the past 3 days
  • Dec 10, 2008, 09:31 PM
    hvacservicetech_07

    Most likely something is blocking the intake or exaust. It could be a chunk of ice or even a bird or wasp nest. When either pipe is restricted the pressure switch will not close.
  • Dec 10, 2008, 09:31 PM
    hvacservicetech_07
    K, check and make sure snow or ice is not covering the intake and exaust on the roof, I'm willing to bet you have a ball of ice over the intake.
  • Dec 10, 2008, 09:33 PM
    JJOHNSON27

    You're a genius. Thank u so much! I will get someone up there tomorrow to try and clean out. Thank u again

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