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    khaley's Avatar
    khaley Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Apr 23, 2009, 09:42 AM
    a/c fan won't stay on (thermstat ?)
    My heater worked like a charm this winter. I recently turn on the air. I have a honeywell thermostat ct8775c. When the fan is in the AUTO position it won't turn on. The fan will turn on if in the 'ON" position though.

    Wireing was done this past winter.

    I noticed this

    Red wire is connected to the R - There is a jumper between the R and Rc
    The rest of wires are correct

    Green to g
    Yellow to y
    White to w

    WHy does the heater work in the auto position but the a/c won't?
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member
    		  
    #2

    Apr 23, 2009, 12:08 PM

    Could be a loose connection in the thermostat that turns on the auto portion of the thermostat.

    Switch the on - auto switch several times putting a little pressure against the switch, it may not be making connection.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #3

    Apr 23, 2009, 01:14 PM

    Probably the cooling fan relay on your control board.
    khaley's Avatar
    khaley Posts: 5, Reputation: 1
    New Member
    		  
    #4

    Apr 24, 2009, 02:01 PM

    How do you fix that cooling fan relay?

    It runs fine on the auto position with the heater on
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member
    		  
    #5

    Apr 24, 2009, 07:09 PM

    In the heating mode there is a different switching system than in the Air Cond mode.
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