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    aznonpho's Avatar
    aznonpho Posts: 8, Reputation: 1
    New Member
    		  
    #1

    Jan 11, 2010, 05:28 PM
    Vacuum switch furnace
    Hello my furnace sucks in air then stops then starts again I checked and the gas and burners are fine while it does this. I taped down this black switch and it worked fine? What's wrong is the switch broken?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 11, 2010, 05:49 PM
    Well I have no idea what the black switch is but if it is not working correctly then whatever is supposed to depress it correctly is not working since you have to use tape.

    A guess is it is the blower door access safety switch. The door has to fit tight for the switch to activate OR the switch is not working as it should.
    aznonpho's Avatar
    aznonpho Posts: 8, Reputation: 1
    New Member
    		  
    #3

    Jan 11, 2010, 05:54 PM

    Umm every time I push it in the status light turns red which means everything is working fine?
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #4

    Jan 11, 2010, 05:59 PM

    As hvac1000 said, the black switch is most likely the blower door safety switch. This switch is held in either by the blower compartment cover, or a piece that is connected to the blower compartment cover. Leave it taped for now, put the covers back on and see if furnace works correctly overnight. If it does, look further into why the switch is not staying closed with covers on.
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