Furnace won't light just a buzz when it calls for heat

Post in 'It's a Gas!' started by thz123, Jun 1, 2012.

  1. thz123

    thz123
    Expand Collapse
    Member

    Joined:
    Jan 8, 2009
    Messages:
    84
    Likes Received:
    0
    Loc:
    IOWA
    I have a Goodall LP gas furnace, I think its 92% efficient. Last night (May 31,12) we had 42 degrees. So I decide to warm the place up a few degrees, adjust thermostat up, and no heat. I went down to the furnace, it was buzzing or humming. I looked in the little round window and there was no fire. The air conditioner and blower motor work. So did the flame igniter fail? What is wrong with it? If it matters my LP tank is 45% full, 500 gallon tank. Thanks for the help.
     
    Collapse Signature Expand Signature

    Helpful Sponsor Ads!





  2. yooperdave

    yooperdave
    Expand Collapse
    Minister of Fire

    Joined:
    Oct 26, 2010
    Messages:
    1,127
    Likes Received:
    210
    Loc:
    Michigan's U.P.
    Make sure that the thermostat is in the heat mode and not the ac mode, first comes to mind...
     
    Collapse Signature Expand Signature
  3. DAKSY

    DAKSY
    Expand Collapse
    Patriot Guard Rider Moderator
    Staff Member

    Joined:
    Dec 2, 2008
    Messages:
    6,373
    Likes Received:
    1,139
    Loc:
    Averill Park, NY, on Burden Lake II...
    Is it a standing pilot unit?
    What type of ignition does it have?
    Have you looked at your owner's manual?
     
    Collapse Signature Expand Signature
  4. blades

    blades
    Expand Collapse
    Minister of Fire

    Joined:
    Nov 23, 2008
    Messages:
    2,158
    Likes Received:
    579
    Loc:
    WI, Milw
    Gas valve will not open until sail switch detects exhaust air flow from exhaust fan. That switch is a sticking point on almost all brands ( new hot water heaters also). Sometimes the switch goes bad other times there could be something blocking its ability to move and of course it could be the exhaust fan motor. The first 2 are the most common problems in a no heat ( gas valve doesn't open) Buzzing sound is likely the ignitor there is a timer in the circuit that will turn it off and it will try to establish the exhaust flow sequence again. I think there is a cycle limit also where it will go into shut down mode for awhile before it tries again.
     
    Collapse Signature Expand Signature
  5. begreen

    begreen
    Expand Collapse
    Mooderator
    Staff Member

    Joined:
    Nov 18, 2005
    Messages:
    60,657
    Likes Received:
    7,676
    Loc:
    South Puget Sound, WA
    The igniter is what I would check out first. We had that happen on our old Arco 92%.
     
    Collapse Signature Expand Signature

Share This Page