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    guitarlos's Avatar
    guitarlos Posts: 3, Reputation: 1
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    #1

    Oct 6, 2011, 03:41 PM
    What makes a furnace venter pressure switch close?
    My furnace will not come on. The LED flashes 3 times, which tells me the venter is plugged or my pressure stch is open. I bypassed the pressure switch and everything works fine. I installed a new pressure switch and the furnace came on as normal and the LED stayed on as it is meant to. I put the covers bck on the furnace. Te next evening I turn the furnace on and the same thing happened... LED blinks 3 times... pressure switch not closing... I can bypass it again and fuace works. Any suggestion?
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #2

    Oct 6, 2011, 06:40 PM
    The inducer motor(vent motor) closes the pressure switch. It checks to make sure your vent is not restricted. On a 90% furnace if the exhaust vent, intake or condensate drain is restricted the switch will not close. NEVER BYPASS A Safety SWITCH. Give more info about your system if you can.
    guitarlos's Avatar
    guitarlos Posts: 3, Reputation: 1
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    #3

    Oct 6, 2011, 08:12 PM
    I just had a new condensate pump installed. That's when my problem stated. Is it possible that the drain was not properly connected?
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