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    vytama's Avatar
    vytama Posts: 2, Reputation: 1
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    #1

    Nov 11, 2010, 11:38 AM
    York furnace Diamond 80 blowing cold air
    Hello,

    Our Diamond 80 furnace blows cold air when thermostat is set on 69F. So far I have cleaned flame sensor, replaced control board, limit switch and air pressure switch. The flame is coming on and works fine (no codes either). The first floor still gets somewhat warm air but the warm air does not reach second floor. Does anyone know what the problem is?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Nov 11, 2010, 06:31 PM

    Is the blower motor running?
    vytama's Avatar
    vytama Posts: 2, Reputation: 1
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    #3

    Nov 13, 2010, 05:24 AM
    Yes, the blower is working. What else do I need to check?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Nov 13, 2010, 07:59 AM

    Check to see if there is some sort of damper int the duct going to the upstairs
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