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  1. #1
    Join Date
    Aug 2008
    Posts
    26

    Gurgling sound from central heat (gas)

    About once or twice a day, when the central heat (natural gas) cycles off, a gurgling sound comes from the furnace area. Any ideas what this could be?

    I'm not too smart on my HVAC system so it may be something I need to call a technician for.

    Thanks
    C

  2. #2
    Join Date
    Feb 2004
    Location
    5280
    Posts
    466
    What type of furnace do you have?
    "We'll have to outwit the fiend with our superior intelligence." Yukon Cornelius

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  3. #3
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    Assuming it is forced air, not hydronic and it is 90%+ condensing type furnace, the noise most likely is the condensate drain system. If there is a self cleansing humidifier connected to the drain system and it's running, that could also account for the noise.
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  4. #4
    Join Date
    Feb 2003
    Location
    pittsburgh,pa
    Posts
    727
    If you have a 90+ furnace sounds like ,condensate pump running after furnace cycles off

  5. #5
    Join Date
    Aug 2008
    Posts
    26
    Its a Ducane. Not sure if it is 90% or not. Is this a problem I need to do something about?

  6. #6
    Join Date
    Aug 2008
    Posts
    42
    Could be a bad check valve at the disharge of the condensate pump letting water drain back into th pump.

  7. #7
    Join Date
    Jul 2004
    Location
    Massachusetts
    Posts
    6,837
    I would recommend having it checked by a knowledgable HVAC techncian. It could be just a condensate pump and that's not a problem. However it could also be a drain problem regardingn condensate from the furnace itself. Frequently when the furnace is involved, it's warning of a coming no heat situation. So have it checked just to be safe and possbily avoid an unanticiapted service call at some inopertune time.
    If YOU want change, YOU have to first change.

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  8. #8
    Join Date
    Nov 2008
    Location
    MI
    Posts
    16
    It sounds like a drainage problem to me also.

  9. #9
    Join Date
    Jul 2006
    Posts
    6,537
    Next time it runs , go outside and listen to the flue. Many times after installation if the flue pipe is not supported properly it can sag trapping moisture and making a gurgeling sound. Turn the furnace off at the switch and see if water returns from somewhere.
    You sure are cocky for a starving pilgrim.

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