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Air handler fan operation

Fan motor cycles on/off never coming up to full speed

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  • michael222 Jun 03, 2008

    this motor is a variable speed Trane operated by an electronic control board in conjunction with a speed control module mounted on the rear of the motor housing.Trane supplies a special wiring harness to assist in trouble shooting this particular type of system.By use of this tool you can isolate the problem which is most commonly found to be the control module.Module replacement is significantly less costly than the motor replacement.

  • Anonymous Dec 31, 2008

    Technician like to replace motor & control board for $875.00 with only 1 year warranty. /No way /If this is a good sistem repairs are worst. ????

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If the motor has a running capacitor check to see if it is bad. A split phase capacitor being bad will cause the motor to draw more electricity and result in the internal overload cycling the motor off. When it cools it will try again. Also check the motor for possible need of lubrication. This will be indicated by it not turning freely.

Posted on Jun 02, 2008

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