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    bass2118's Avatar
    bass2118 Posts: 1, Reputation: 1
    New Member

    Oct 14, 2007, 06:01 AM
    Trane gas furnace only blow cold air
    My 10 years old trane gas furnace would not blow out warm air, only cold air. I checked gas is on and electric switch is on. Every thing seems normal. It may be the ignition problem. How can I find out?
    Your help is greatly appreciated

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

    Oct 14, 2007, 02:16 PM
    It could be many things. Is the thermostat turned on to heat? Is the temperature setting high enough to have the heat come on?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member

    Oct 14, 2007, 03:52 PM
    Check sequence of operations in the sticky at

    Usually the controls wouldn't let the blower come on unless you had flame. Could be a bad high limit switch or temperature sensor.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member

    Oct 14, 2007, 06:53 PM
    Usually. When the fan runs non stop. On a call for heat you have an open limit in the circuit somewhere.

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