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    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #1

    Jul 13, 2008, 11:16 AM
    A/C fan runs all the time
    I have a A/S 4tee3f49a1000a and today I noticed the fan run continuously. I disconnected the thermostat and still runs. Only way to turn off is the switch.

    I think I need a Fan Control Board CNT03600?

    Any ideas where I can get 1 and not get ripped off?


    ED
    :confused:
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 13, 2008, 11:36 AM
    I check eBay and no one has one for sale right now. That is about the cheapest place you will find one.
    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #3

    Jul 13, 2008, 12:04 PM
    Quote Originally Posted by hvac1000
    I check ebay and no one has one for sale right now. That is about the cheapest place you will find one.

    Sound like that is the problem?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jul 13, 2008, 03:24 PM
    Yep
    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #5

    Jul 13, 2008, 04:07 PM
    Watching this run now I see it comes on faster when the compressor is running then then slow down when it should be off. Any idea how much the cnt03600 board is?

    Ed
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jul 13, 2008, 05:33 PM
    Is that a variable speed unit with dip switches it might be setup to runall the time on low when system is not running. Read below.

    http://www.aireng.com/clientuploads/Coils_etc/4TEE.pdf
    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #7

    Jul 13, 2008, 07:06 PM
    That's the unit but in American Standard. It ran correctly until a few days ago.
    The switches were not moved and I cannot turn off fan at thermostat now.
    I do have the sheet similar to the link with dip settings.

    Know what the 2 LED (Y&YO)do?

    Thanks
    ED
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #8

    Jul 13, 2008, 07:08 PM
    If this is an outside condenser fan that is giving the problem I may have an idea. This motor would be a 240 volt motor and it is possible that one leg of the 240 volts has grounded and is passing 120 volts through the motor making it turn at about half speed, some contactor only break one leg when they are off and still lets 120 volts go through the motor back to the other leg on the contactor that is open. The only way to remedy this situation is to replace the motor, But it is something that you need to confirm before you change motors.
    If this turns out to be the problem please let me know.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #9

    Jul 13, 2008, 09:11 PM
    ED... hope you are sitting when your read this. I've seen that control board, CNT03600 online, with free shipping... for $340.00. Let the fan run and keep looking around.
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,532, Reputation: 94
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    #10

    Jul 13, 2008, 09:32 PM
    Which fan are we talking about... the indoor (blower) fan or the condenser fan?. Letmetellu made me wonder to which you were referring.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
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    #11

    Jul 13, 2008, 10:54 PM
    Sounds like a stuck relay on the control board, try some local Trane or american standard dealers, or like hvac1000 said, eBay, but it's unlikely that you will find exactly what you need there. They are very simple to change, replace wire for wire, and you will have no problem.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #12

    Jul 13, 2008, 11:35 PM
    That's the unit but in American Standard

    Trane is Am Standard.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #13

    Jul 13, 2008, 11:37 PM
    This is one reason I dislike control boards. A few years ago a 20.00 relay would have done the trick.
    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #14

    Jul 14, 2008, 03:22 AM
    Sorry all- I found the problem. The fan switch was on!

    We had guests for the week and I guess someone moved the switch.

    I forgot there is a 3 minute delay going into off mode!

    Now I have to change the motor in the roof fan (On my third motor)

    Thanks for all the help!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #15

    Jul 14, 2008, 03:55 AM
    This is showing the part as a

    This `Trane CNT 03600 ignition control board`?? Strange
    edcp's Avatar
    edcp Posts: 6, Reputation: 1
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    #16

    Jul 14, 2008, 07:36 AM
    I saw that it also is a igniter board maybe for a furnace.

    I am OK now

    Thanks for the help.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #17

    Jul 14, 2008, 09:37 AM
    Do they put fan control boards on condensers? If so what brand?
    mjquicksales's Avatar
    mjquicksales Posts: 1, Reputation: 1
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    #18

    Nov 6, 2008, 08:52 PM
    Quote Originally Posted by edcp View Post
    I have a A/S 4tee3f49a1000a and today I noticed the fan run continuously. I disconnected the thermostat and still runs. Only way to turn off is the switch.

    I think I need a Fan Control Board CNT03600?

    Any ideas where I can get 1 and not get ripped off?


    ED
    :confused:
    I Think I can get you one for $25 +$9 Shipping or you can just go

    D Williams
    [email protected]
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