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

    Dec 18, 2006, 09:44 AM
    Furnace blows cold air
    Yesterday my furnace stopped heating my home. It is 3 years old & I did some minor troubleshooting. The filter is not clogged and the blower is circulating air normally. I checked inside the unit & the ignitor coil is heating and starting the gas jets burning, but they shut off after about 10 seconds of burning, so no heat is entering the blower and I just get cold air. Since these functions seem normal, is it possibly a problem with the thermostat not telling the heater that it needs warm air? No matter how high I turn the temperature up on my wall thermostat, the furnace will not turn on. It only turns on when I change the setting from 'auto' to 'on'.
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Dec 19, 2006, 06:26 AM
    It isn't the thermostat. It is starting the heating sequence. More like the flame detector, a little ceramic dodad with wires right where the flame will hit it. If it doesn't send a signal to the board, it will shut the gas off in a few seconds. Clean up the metal contacts. Replace it if broken or cracked.
    rickdb1's Avatar
    rickdb1 Posts: 185, Reputation: 15
    Junior Member
    		  
    #3

    Dec 19, 2006, 08:44 AM
    Look for the flame sensor. Clean the rod with emery cloth...

    coolbreeze444's Avatar
    coolbreeze444 Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Jan 11, 2007, 10:09 AM
    Comment on rickdb1's post
    This is on point... I believe that this might me the most common problem.
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