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  1. #1
    Join Date
    May 2017
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    smyrna tennessee
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    ecm motor wont stop running

    Maybe im missing something. Have this 2 ton trane pkg unit heatpump im working on. The ecm fan runs all the time. Homeowner called me said he replaced the icm board board model is cnt03600. but fan still runs. no 24v at green wire or white wire. I even took thermostat off wall disconnected green wire at thermostat and the unit even though it wasnt getting any voltage but ecm moter still runs. heatstrips look fine no hi limit switches i can see anywhere. Only way to get ecm motor to quit is to unplug 8 or 9 pin connector off icm cnt03600 board and it stops. Im thinking its a bad board even though he just put it in. Any ideas got me stumped thanks

  2. #2
    Join Date
    Dec 2012
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    columbus, OH
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    If this was in the pro forum ide go get my ecm book i got from trane and tell you what pins to look for 24v at. Unfortunately im not allowed to do that per site rules:/

    Sent from my SM-S320VL using Tapatalk

  3. #3
    Join Date
    May 2017
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    Maybe its the wiring harness i had a similar problem like that but with a carrier unit it had something to do with the resistor. Whats the model and serial # maybe i can download a pdf of schematics to try and help

    Sent from my SM-N920P using Tapatalk

  4. #4
    Join Date
    Feb 2006
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    Phoenix,AZ
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    If it aint the board what could it be? The module perhaps?

  5. #5
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    May 2017
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    smyrna tennessee
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    Thread Starter
    model number wcy024g100bb
    serial 4382n2d1h

  6. #6
    Join Date
    Dec 2012
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    columbus, OH
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    Quote Originally Posted by KB Cool View Post
    If it aint the board what could it be? The module perhaps?
    Whats the off chance an ecm modue could fail?

    Sent from my SM-S320VL using Tapatalk

  7. #7
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    May 2017
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    smyrna tennessee
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    Thread Starter
    thats what im thinking either bad board or the module but im not too up to par on the ecm motors

  8. #8
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    Feb 2006
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    Quote Originally Posted by tnbumble View Post
    thats what im thinking either bad board or the module but im not too up to par on the ecm motors
    Buy a ecm tester and you'll know which ones bad. No guessing!!!

  9. #9
    Join Date
    Dec 2012
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    columbus, OH
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    Ive got 3 ecm testers and ive never used one of them. I find the manual jumper test easier. With the exclusion of nordynes broad ocean motors without the tester you are just guessing.

    Sent from my SM-S320VL using Tapatalk

  10. #10
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    May 2017
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    smyrna tennessee
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    Thread Starter
    thanks buddy ive just never seen am ecm motor stay running , the ones ive seen wont run but always a 1st

  11. #11
    Join Date
    Dec 2012
    Location
    columbus, OH
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    Ive seen a good bit of x13s run constantly and a broad ocean. All the x13s im aware of are genteq same as train.

    Sent from my SM-S320VL using Tapatalk

  12. #12
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    Any electrical device can fail in unexpected way.

    You need to get the tester and connect it. That way, you can confirm that no run command is being sent to the motor, and you will confirm the module is defective it it runs when the tester says it should not.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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