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    paul789's Avatar
    paul789 Posts: 8, Reputation: 1
    New Member
    		  
    #1

    Dec 6, 2009, 09:47 PM
    Gas furnace clunking
    Trane gas furnace, at least 11 years old, mounted in attic. Earlier tonight it started making a "clunk clunk" sound, followed about three seconds later by a fainter single "click". A couple of seconds later it starts again with the "clunk clunk."

    Turn the furnace off and everything stops. Wait a few minutes , turn it back on and the cycle starts again. After an additional 30 to 60 seconds the fan starts But, there is no light-off - no flame.

    Can't tell where the "clunks" are coming from. It might be the gas valve. With my hand on the gas valve a vibration can be felt there with each clunk. The 'click' seems to come from deeper inside the furnace.

    Any suggestions or ideas? Thanks.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Dec 6, 2009, 10:48 PM

    Sounds like the ignitor is bad. Could be spark or hot surface. It should glow or spark depending on type.
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