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

    Dec 14, 2007, 12:22 PM
    Criterion II Furnace Flame sensor
    My furnace will not turn on at all. I try resetting the thermostat but it still will not work. I checked some of the troubleshooting website and they said that the flame sensor.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 14, 2007, 04:13 PM
    If the furnace will not turn on at all I would check the power supply going to the furnace first. Then check the 24 volts from the transformer located in the furnace itself.
    DEWRIGHT's Avatar
    DEWRIGHT Posts: 1, Reputation: 1
    New Member
    		  
    #3

    Dec 30, 2010, 12:10 PM
    I check my 24 volts from the transformer in the furnace and its on. The PWR and the OK light is on too. And I get nothing
    Stevepc's Avatar
    Stevepc Posts: 1, Reputation: 1
    New Member
    		  
    #4

    Jan 10, 2013, 09:50 AM
    The air coming in through the floor vent could be too cold and the thermocouple does not sense the glow plug. I put aluminum as a partial cover over the floor vent so the cold air does not go directly on the thermocouple. Kind of like a air scoop with the opening away from the thermocouple. Leave an opening so air does come in. Otherwise clean the thermocouple with Emory cloth.
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