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  1. #1
    Join Date
    Aug 2004
    Location
    Apex, North Carolina, United States
    Posts
    57

    Vari. Speed AH Motor issue

    I was at a call yesterday with a Carrier/Bryant Variable Speed Air Handler, Model#: FV4BNF003, the motor is running at a very low speed, and will not pick up speed, switched the fan to on at the thermostat and moved the pin on the easy select board to high on the continuous fan section of the board but the motor is still moving at a slow rate of speed with minimal change with door on and off. Ductwork is in good condition with no collapsed ductwork. Any ideas on what I should look for, I would think something is wrong with the module on the motor.

    Thanks for any help.

  2. #2
    Join Date
    Jun 2011
    Location
    sfv california
    Posts
    107
    u need an ecm motor tester it plugs into the module between board and module, high voltage stays put, then kick it on, it should run the motor thru all speeds, only way to tell if it's the board or mod

  3. #3
    Join Date
    Sep 2007
    Location
    NC
    Posts
    28
    Is this a new system that has never worked correctly or an older one that has stopped working?

  4. #4
    Join Date
    Aug 2004
    Location
    Apex, North Carolina, United States
    Posts
    57
    The system is 3 years old, everything has been working fine up until 2 days ago the homeowner said.

  5. #5
    Join Date
    Oct 2011
    Location
    South Carolina
    Posts
    31
    Capacitor maybe? which on ECM they are internal and you cant replace them, Or thats what we have been led to believe.

  6. #6
    Join Date
    Jun 2009
    Location
    Pinellas Park, FL
    Posts
    1
    Quote Originally Posted by saloh01 View Post
    I was at a call yesterday with a Carrier/Bryant Variable Speed Air Handler, Model#: FV4BNF003, the motor is running at a very low speed, and will not pick up speed, switched the fan to on at the thermostat and moved the pin on the easy select board to high on the continuous fan section of the board but the motor is still moving at a slow rate of speed with minimal change with door on and off. Ductwork is in good condition with no collapsed ductwork. Any ideas on what I should look for, I would think something is wrong with the module on the motor.

    Thanks for any help.
    test the eletric heat it should kick it in high speed. use a ecm motor tester if it won't go in any other speed and is stuck in low check wiring harrnes then it is a bad board.

  7. #7
    Join Date
    Nov 2004
    Location
    Austin, TX
    Posts
    871
    Some carrier ecm motors will run at half speed when the G terminal is not energized and Y is energized. Dropping the G input signals the board to go into dehumidify mode. Make sure you haven't lost the g input. I don't remember if that behavior is restricted to just furnaces or if it is included in air handlers also.
    “I am for doing good to the poor, but...I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it. I observed...that the more public provisions were made for the poor, the less they provided for themselves, and of course became poorer. And, on the contrary, the less was done for them, the more they did for themselves, and became richer.”
    ― Benjamin Franklin

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