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    chuckno9's Avatar
    chuckno9 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jan 17, 2008, 05:00 PM
    Why do the burners go out before the fan even comes on?
    The furnace ignites quickly with a blue flame and burns for approximately 2 minutes.
    Then the whole unit stops silent for about a second.
    Then the fan finally comes on after all of this and blows somewhat hot air for approximately
    3 minutes.

    The entire cycle is 2 minutes of burners, then 3 minutes of fan, then off for about 5 minutes.

    It does keep the house at the temp I set the thermostat at. But it seems very inefficient.

    Thermostat is set to 60'


    Thanks for any help

    Chuck Norris
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jan 17, 2008, 05:05 PM
    Hi Chuck Norris. It sounds like your furnace has the Judo Chop Syndrome. LOL

    It could be
    The heat anticipator in the thermostat which will cause the burner to short cycle.
    It could be the fan limit control that has gone out of calibration.
    Keeping a low temp of 60 degrees depending upon the size of the house and the BTU capability of the furnace could trigger a short cycle situation.
    therinnaiguy's Avatar
    therinnaiguy Posts: 153, Reputation: 5
    Junior Member
    		  
    #3

    Jan 18, 2008, 06:39 AM
    Question, If you raise the temperature to say 65, does the unit stay running longer?
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