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    mike iw112's Avatar
    mike iw112 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 12, 2015, 06:13 PM
    Furnace not igniting
    Model MPGA100B4B Ducane shows pressure switch stuck open/closed but have checked and replaced it. Old one was fine. No blockage in tube or port. Changed circuit board and ignitor. Still shows code for pressure switch stuck. Any help would be great
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
    Ultra Member
    		  
    #2

    Mar 13, 2015, 03:57 PM
    Make sure your wiring is correct & in tact. Check the exhaust pipe & intake, if so equipped, for blockage. A quick test is to disconnect the exhaust to see if the furnace will light. If it does, the problem is in the exhaust pipe. It must slope upward away from the furnace at a slope of 1/4"/foot of run with no bellies or sags.
    Sometimes a plugged condensate drain or trap will cause that code as well.
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