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    nohandyman39's Avatar
    nohandyman39 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 1, 2009, 07:23 AM
    Cold air, no heat
    During the night the heat in my HVAC stopped working.
    I switched it to air and turned down the thermostat and the AC kicked on, I switch it back to heat and nothing, tired "auto" and "fan" settings.
    It was working fine when I went to bed, heating fine, kicking on and off just fine, then nothing.
    WallyHelps's Avatar
    WallyHelps Posts: 1,018, Reputation: 136
    Ultra Member
    		  
    #2

    Dec 1, 2009, 07:38 AM

    I would suspect either the thermocouple or the "Hot Surface Ignitor" (HSI) have failed.

    You'll have one or the other, depending mostly on the age of your furnace. If it is 20 or more years old, you'll have a pilot light with a thermocouple. If it is newer, you'll probably have a HSI.

    Both are pretty easy to replace. Once you see them, you should be able to see what to do. If not, let us know.

    Best of luck,
    WallyH
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Dec 1, 2009, 09:40 AM
    Exact model and brand name?
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