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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 Member

    Jan 8, 2009
    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.

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  2. yooperdave

    yooperdave Minister of Fire

    Oct 26, 2010
    Michigan's U.P.
    Make sure that the thermostat is in the heat mode and not the ac mode, first comes to mind...
  3. DAKSY

    DAKSY Patriot Guard Rider Staff Member

    Dec 2, 2008
    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?
  4. blades

    blades Minister of Fire

    Nov 23, 2008
    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.
  5. begreen

    begreen Mooderator Staff Member

    Nov 18, 2005
    South Puget Sound, WA
    The igniter is what I would check out first. We had that happen on our old Arco 92%.

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