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    mac tech's Avatar
    mac tech Posts: 4, Reputation: 1
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    #1

    Jul 18, 2008, 11:37 AM
    Bryant AC blower fan motor "quick" cycling
    While running in AC mode or fan ON mode the blower fan keeps cycling on/off contiuously for on off periods from less than a second to several minutes.
    I figured the motor was overheated (bad windings) so I replaced the motor and capacitor with poor results.
    It seems to run longer but contiues to "quick" cycle... acts like a bad wire connection or something.

    Any ideas on next steps...
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #2

    Jul 18, 2008, 11:59 AM
    What is the brand and model number of your thermostat?
    mac tech's Avatar
    mac tech Posts: 4, Reputation: 1
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    #3

    Jul 18, 2008, 12:25 PM
    It is a lux 9000
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #4

    Jul 18, 2008, 12:48 PM
    There are three different models of 9000 thermostats. Can you be more accurate. I need the complete correct model.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #5

    Jul 18, 2008, 12:51 PM
    http://www.luxproducts.com/ART/suppo...Eng_Manual.pdf


    http://www.luxproducts.com/ART/support/tx9000ts_eng.pdf

    Here are two manuals. The third one is for a remote control model and I do not believe you have that one.
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    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jul 18, 2008, 12:54 PM
    If it is not the thermostat it could be a low voltage/thermostat wire shorting out causing this.

    Do you have a circuit board in your unit?

    What is the indoor section model number
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    mac tech Posts: 4, Reputation: 1
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    #7

    Jul 18, 2008, 01:54 PM
    It is neither of these listed onn their website they are TX9000 mine is a lux 9000.
    I don't see it listed, even in the discontinued, and have inquired with them as to what I have.

    Yes there is a circuit board in the cabinet with the blower. I will look for the model number.
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #8

    Jul 18, 2008, 02:41 PM
    If you would please explain what the blower does when you turn the fan to "ON" and the AC is in the "OFF" position.
    Leave it that way for five minutes and then feel the motor, for heat.

    Also does the blower do the same thing when the heat is turned on?
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    mac tech Posts: 4, Reputation: 1
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    #9

    Jul 18, 2008, 05:42 PM
    The fan was staying on even when the thermostat was in the system off mode.

    I looked closely at the internal circuit board that hvac1000 had asked about.

    It had moisture on it. The drain line was slightly plugged causing water to pool and run down on the board.

    I cleaned the drain and dried out the board with an air line and all is good. Operating fine now. Thanks... hvac1000 and letmetellu
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    hvac1000 Posts: 14,540, Reputation: 435
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    #10

    Jul 18, 2008, 06:02 PM
    I hope the board holds up. Sometimes when they get water on them they eventually die. At least now you know what part to replace.
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #11

    Jul 19, 2008, 12:46 PM
    Where the water was on the board it might be a good idea to clean the area more to remove any residue and then cover the area with a clear fingernail polish.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #12

    Jul 19, 2008, 03:20 PM
    That is a good idea letmetellu. In the past I have actually put circuit boards in the oven at low temperature to force the drying issue.there is also a spray can of electronic parts cleaner that has the pressure to blow the water out and then safely evaporate leaving a very lite film of protection that prevents the relay contacts from going bad. Clear laquer spray to coat the board was the last step
    .

    We used cases of that stuff during the flood of 1997 on electric main panels and circuit breakers to clear out the water and help prevent corrosion.
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