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  1. #1
    Join Date
    Oct 2012
    Location
    bayside n.y
    Posts
    4

    trane rtu model# YCD240B3HAJB

    Hi, i was wondering if someone can shine some light on a problem im having with trane rtu unit.im new to hvac talk.model ycd240b3hajb. the induced motor is running continouasly even when t-stat is off.on a call for heat it goes throu the whole cycle and heat comes on.when it satisfies,or when u turn off heat on t-stat everything cycles off but the induced fan motor continues to run.im thinking its the ignition control board that needs to be replaced but want to confirm before i start replacing parts.could it also be the induced motor thats defective causeing it not to shut down?maybe internal switch is stuck closed in motor. any suggestions? thanks

  2. #2
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,516
    Quote Originally Posted by tech master View Post
    could it also be the induced motor thats defective causeing it not to shut down? any suggestions?
    There was a service bulletin on this that said the motor windings may fail internally and allow the motor to run without a call for heat.

    What is the serial number sequence ?
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
    Join Date
    Dec 2010
    Location
    Down by the river
    Posts
    1,650
    As stated above, inducer motor bulletin has expired

  4. #4
    Join Date
    Oct 2012
    Location
    bayside n.y
    Posts
    4
    serial number 346100457d. i dont think its the induced drft motor.if windings were bad motor wouldnt run at all.

  5. #5
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,516
    Quote Originally Posted by tech master View Post
    serial number 346100457d. i dont think its the induced drft motor.if windings were bad motor wouldnt run at all.
    Not necessarily true. This bulletin states just that.

    Your serial number falls within the sequence of numbers for this bulletin, even if the bulletin has expired.
    Instead of learning the tricks of the trade, learn the trade.

  6. #6
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Quote Originally Posted by rundawg View Post
    There was a service bulletin on this that said the motor windings may fail internally and allow the motor to run without a call for heat.

    What is the serial number sequence ?
    Hey Rundawg, I have a job where i got 22 YCD300B4HAHB and have personally witnessed this problem. Before there was a bulletin on this, we had one unit catch on fire and we could not figure out what happened. It ended up that ALL the controls had to be replaced. It started with a bad inducer motor which shorted every control in the unit. The 460 volt transformer caught on fire. It was a mess.

    It ended up after watching the other units run that the 2-speed inducer motor would short out what appeared to be between the windings of LO and HI speed. It would work fine in LO speed but when the 2nd stage of heat would come and energize the HI speed the motor would burn the windings. If you did not catch it in time the motor would short the winding and some how send line voltage back through the low voltage side (probably through the IGN Board) and fry EVERYTHING.

    I think it is originally caused by a bad Run capacitor which in my case are 5 MFD / 440 Volt. And if left unnoticed the motor windings get hot when the run cap is less than 10% of it's rating.

    As for the Bulletin I think Southern Mech is right that it may have expired. But this definitely must be fixed. There is a kit complete with all new wire harness, and an isolation contactor which will lock out HI/LO inducer speed or windings .

  7. #7
    Join Date
    Oct 2012
    Location
    bayside n.y
    Posts
    4

    induced motor

    Quote Originally Posted by tech master View Post
    Hi, i was wondering if someone can shine some light on a problem im having with trane rtu unit.im new to hvac talk.model ycd240b3hajb. the induced motor is running continouasly even when t-stat is off.on a call for heat it goes throu the whole cycle and heat comes on.when it satisfies,or when u turn off heat on t-stat everything cycles off but the induced fan motor continues to run.im thinking its the ignition control board that needs to be replaced but want to confirm before i start replacing parts.could it also be the induced motor thats defective causeing it not to shut down?maybe internal switch is stuck closed in motor. any suggestions? thanks
    hey alcomech,what do u think the problem is?the induced motor keeps running after t-stat is set on off.u think its the ignition board?thats what gives power to the motor?

  8. #8
    Join Date
    Dec 2010
    Location
    Down by the river
    Posts
    1,650
    Quote Originally Posted by tech master View Post
    hey alcomech,what do u think the problem is?the induced motor keeps running after t-stat is set on off.u think its the ignition board?thats what gives power to the motor?
    No, bud. There are many issues with this its the inducer fan motor. I just replaced on last Friday, which would make about the 100th one. Easy test, pull the wires for high and low off the board, it still runs.

    Again there is a bulletin for it but it has expired

  9. #9
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,854
    someone is not a master with the Trane YCD model.

    the windings will short which makes the motor run continuous. There is a bulletin for this. you unplug hi and low from the board. if motor still runs then its the motor.

    i had one also the other day.

  10. #10
    Join Date
    Feb 2012
    Location
    Toronto Canada
    Posts
    1,090
    Im gonna N00B it up
    What does it matter if the bulletin is exspired it still tells you the problem and needed test to fix it. I am geussing that the manf will not pay to fix it is what that means?

    How do you get to see all these bulletins for RTU? You have to be a dealer of the manf right?

  11. #11
    Join Date
    May 2011
    Location
    Spring City, Pennsylvania, United States
    Posts
    190
    I'm on the "inducer needs to be replaced" bandwagon. Seen this a few times. If you do a search on here you'll see a ton of threads about this.

  12. #12
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,579
    It's the inducer motor. First saw the problem got to be close to 8 years ago or so. Double check the relay on the ICB for burn marks, replace if necessary and don't forget to clean the burner screen. It should be plugged with cottonwood.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  13. #13
    Join Date
    Jul 2010
    Location
    So-Cal
    Posts
    579
    Inducer motor! and it aint cheap.

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