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ECM motor module repair

Siddan
Siddan over 2 years ago

imageimageHi guys I need help to fix my ECM blower motor module. It third time I am replacing motor on my water heater tank that works on natural gas. Each time the motor cost me 1850$ plus the labour to replace it.
The motor runs on 120v and speed regulated by contrôler by giving 36v duty cycle. The problem with the motor module is that it is stuck on high speed which is 100% duty cycle. I am sure it is one of the components on the module is defective that can replace to fix the problem. I don’t know how to upload the pictures.

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  • anniel747
    anniel747 over 2 years ago in reply to Siddan +2
    Deleted
  • colporteur
    colporteur over 2 years ago in reply to anniel747 +2
    Great Share!
  • Siddan
    Siddan over 2 years ago in reply to michaelkellett +1
    I think so too. But these company make a lot of money on these part. First they sell you expensive appliances and then they rip you off on parts. Take a look at my receipt.
  • Siddan
    0 Siddan over 2 years ago

    I had the pics uploaded 

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  • michaelkellett
    0 michaelkellett over 2 years ago

    That certainly doesn't look like an $1850 value part !

    First of all, tell us about make and model of the heater and the blower. Maybe there is some information on the web about why they fail.

    After that you are going to need much better pictures showing the components in the motor assembly. If this is a dead one there is little to loose by taking it apart.

    Unlesss you can get service information you'll need to look for visibly damaged or overheated parts.

    Then it gets hard, to fault find something like this needs some proper test gear unless we get very lucky.

    MK

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  • dougw
    0 dougw over 2 years ago

    Try tracing back from the motor power signal. Maybe the drive transistor is shorted. Or perhaps the motor control circuit is fried with a stuck output pin.

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  • acdc90
    0 acdc90 over 2 years ago

    Hello,from looking at photo i expect the power comes in the 3 pin connector (at 5oclock) then fuse and NTC and bridge rectifier at 3oclock,that feeds caps at 1 oclock are you able to measure under the board at these caps  are the caps in series or parallel if there is a dead output IGBT or fet or bridge rectifier it can be measured across the caps. the IGBT or fets look about 10 oclock,can you measure for shorts across 2 pins of any of the IGBT. or looking from the center outwards is there a black mark on board under IGBT or Fuse or NTC   

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  • anniel747
    0 anniel747 over 2 years ago
    [deleted]
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  • Siddan
    0 Siddan over 2 years ago in reply to michaelkellett

    imageI think so too. But these company make a lot of money on these part. First they sell you expensive appliances and then they rip you off on parts. Take a look at my receipt.

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  • Siddan
    0 Siddan over 2 years ago in reply to anniel747

    i believe your pin out diagram are true. Here take a look at the wires on the motor.image

    image
    image
    image

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  • Siddan
    0 Siddan over 2 years ago in reply to Siddan

    I tried to look for a schematic online but no luck. They might have diagrams of the module where you find the plugs pin out.

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  • anniel747
    0 anniel747 over 2 years ago in reply to Siddan
    [deleted]
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  • colporteur
    0 colporteur over 2 years ago in reply to anniel747

    Great Share!

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