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    marley458's Avatar
    marley458 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 9, 2007, 01:25 AM
    Furnace heat cycles on/off
    We have an old furnace,not quite sure how old.It is a Bryant Quietair.I noticed tonight the burners would light,stay lit for a few seconds(30-40secs.),then go out,and then relight a few seconds later.The fan is running throughout the whole process like it should.This goes on constantly.What is going on in there?Can anyone please help?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Mar 9, 2007, 04:26 AM
    If that older unit has the 3 wire pilot safety assembly it could be defective. When was the last time a professional serviced your furnace? Now could be a good time to have that done and also see why you are having this problem.
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