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    CSR855's Avatar
    CSR855 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 17, 2006, 10:31 AM
    Furnace will not ignite in Auto mode.
    I have an Armstrong-Air Gas-Fired furnace G1D91AU and a programmable thermostat which when I set to heat and says system on but the furnace is not turning on. If I set the thermostat to ON the furnace runs but is blowing cold air. It this a problem with my thremostat or my furnace itself?

    I would appreciate if you can give me an idea where the problem is.

    Thanks!
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #2

    Dec 17, 2006, 02:47 PM
    You need to find out if you are getting 24 volts at the white wire in the furnace when the termostat is calling for heat.
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