Question about Washing Machines

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My Whirlpool WFW9400SW00 does not 'power up'. When the unit is unplugged and plugged in, there is only a quiet 'click', but not power at the control panel.

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  • mtjones May 24, 2009

    The circuit breaker, outlet and incoming power are fine.  How would I locate a blown fuse?


    Also how would I identify a "burned part' within the washer?


    Thanks,
    Mark

  • mtjones May 24, 2009

    Rylee,


    There is no power at the control panel (i.e. no lights), so does that mean it is a problem with the control panel?


    Thanks,
    Mark

  • mtjones May 24, 2009

    Also, where can I locate instructions as to safely removing the control panel, without any risk of damaging the plastic tabs that secure it?  The chronic squeaking of the control panel makes me think that it is not too sturdy.


    Thanks,
    Mark

  • mtjones May 25, 2009

    If the problem is the CCU, I am certainly not qualified to assess that. I would like to eliminate other possible causes for the lack of power at the control panel, such as fuses, etc.

    Comments like "Also check the Motor Control Unit (MCU) which is located inside a plastic control box located in the lower front corner of the washer cabinet" are simply not helpful. I have no idea what the MCU is, let alone how to check it and how do I access the "lower front corner of the washer cabinet"?

  • mtjones May 25, 2009

    The link that you provided goes to 6 diagrams, so I am confused.


    There is no power at the control panel (i.e. no lights).  Could the door switch(es) cause this problem?


    Mark

  • mtjones May 27, 2009

    There is no sign of moisture at the MCU.


    Could there be a problem with the Interference Filter?


    Is there any other fuse or other simple device that could be preventing power getting to MCU and/or control panel?


    One more thing...when the problem first occurred, the door lock/unlock switch still had power (i.e. there was a tone when pressed).  Now there is nothing.  Does this make any sense?

  • mtjones May 27, 2009

    Sorry, I don't see any fuse.  The incoming power appears to go through the Interference filter, then directly to the MCU.

  • mtjones May 28, 2009

    I have seen a couple of comments on your site re: faulty connections in the MCU/CCU and simply resoldering the connections.  Can you suggest where I might take the unit to be tested/repaired or should I simply call the service guy?  This is getting beyond novice territory.


    I am in Toronto, Canada, by the way.


    Thanks,
    Mark

  • mtjones May 31, 2009

    Can you please provide detailed instructions as to how to remove the control panel and/or the cover on the 'user interface' (i.e. pushbutton controls), so that I can access the MCU and have it tested/repaired?


    Thanks,
    Mark

  • mtjones Jun 14, 2009

    FYI, I did not receive an email notifying me of this post, so I am just reading this now. I assumed that you had given up on me and this situation.

    Also, the 9100/9200 is not similar enough to help me with the removal of the control panel and CCU (the tab and slot references in 4-6B and 4-6C do not exist on this machine). Do you have a manual for this exact machine?

  • mtjones Jun 14, 2009

    Also, instructions in the manual like "begin by removing the cycle selector knob" are simply frustrating. HOW?? It does not pull off easily.

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Check the door switch/switches they are normaly located behind the console at the door latch area. This can be tested with a multimeter in the ohms range (with no power present) put the meter on each contact to the switch and get a friend to toggle the switch it should give an infinite and a low reading on the multimeter.
Check and see if the MCU has been exposed to any water, you can get an understanding of how to get at it by this diagram:
http://www.partselect.com/AdvancedModelSearch.aspx?ModelNum=WFW9400SW00&mfgModelNum=&fkMfgID=3

If there is any traces of moisture in or around the MCU use a hairdryer to dry it out for about half an hour and give it another shot.
Hope this helps

Posted on May 25, 2009

  • 5 more comments 
  • Dudeman321 May 25, 2009

    Some units cut off power to the front panel when the lid is opened.

    The diagram that would be of interest to you is the control panel parts.

    The MCU is the part 14 listed in the diagram. If there is moisture in this unit it can give the results you are experiencing and in many cases just drying out the water can restore operation. Its worth trying to dry out the board for the MCU even if it does'nt look overly damp as no damage can result from this.

  • Dudeman321 May 27, 2009

    Have you tried checking the fuse, just follow where the mains lead comes in and there should be a board with a fuse on it. You normaly take off the back plate of the machine to get access. This can somtimes blow if water has been leaking. If you don't have access to a multimeter you can usually visually inspect it by looking for a break in the wire, if it's a clear glass fuse.

  • Dudeman321 May 27, 2009

    Oh and make sure machine is unplugged when you are testing the fuse. Im sorry I didnt read your original post properly, I thought you had tested the mains fuse.

  • Dudeman321 May 27, 2009

    Yeah, just looked at the mechanical diagram, your right the power goes through the noise filter then to the MCU, there must be a fuse on the MCU board. Check the wires going to the mcu to see if there is power with a multimeter on the AC Volts range (Be careful no to get a shock or touch the probes together). If there is voltage there, then the MCU will need repair/replace.

  • Dudeman321 May 27, 2009

    This site sells the computer (they call it a CCU rather than a MCU):

    http://www.repairclinic.com/Washing-Mach...

    Just make sure you get the one with the same part numbers, they average for around $200. It may be worth trying to get your old unit repaired, also if it is the CCU that is faulty then replace the noise filter as a precaution, it may have been a line spike thats killed it.

  • Dudeman321 May 28, 2009

    I'm not sure of a repairer in your area but, I would recommend taking it to an electronic/tv repair shop to get a quote on repair before you buy another. You may only be looking at $50 to $80 to get a repair for this. If you remove and install the module yourself you will save a lot of money.

  • Dudeman321 Jun 01, 2009

    This service manual should be close enough to your machine it's 9100/9200 manual.

    http://adcxns1.whirlpool.com/Service/Srv...$FILE/Duet%20Job%20Aid.pdf

    The main sections you want are page 29 for the location of the CCU (I call it a micro controller unit, they call it a central control unit), 30 for instructions on removing the top cover and touchpad/led assembly. When you take in the CCU for repair also take in the touchpad/led assembly so this can be examined/repaired at the same time. The service manual states that there is nothing servicable inside the CCU and it should just be replaced, I beg the differ, because these can be repaired by anyone with a good electronics repair knowledge. A good technician at a tv/video repair shop, should be able to fix it, aslong as no major integrated circuit/firmware has fried.

    Cheers and good day, don't forget to rate me if you find this information helpful.

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Hi

First unplug it from the power socket and plug it into a different power socket, you can also try to reset the circuit breaker. If this does not work then you will need to open up your whirlpool washing machine and check the input power coming using a multimeter/ohmmeter. If the power is ok then check for a blown fuse. Please see this link for exploded view of your Whirlpool washing machine.

Whirlpool WFW9400SW00 Cabinet Parts

After this is done please check for the control board wiring and also check if there is any burned part inside the washer.

Whirlpool WFW9400SW00 Control Panel Parts

Please do accept thw solution and revert for further assistance.

Thanks
Rylee

Posted on May 24, 2009

  • Rylee Smith
    Rylee Smith May 24, 2009



    Your whirlpool machine has a lid-switch fuse near the lid switch, inside the control panel. If this fuse blows, the unit won't work until you replace the fuse, however the lights will work on the panel.

    If the lid switch is defective, your washer can't spin and may not function at all. The switch is inside the washing machine main housing near the door frame. You'll need to open the front of the washer to get to the switch. If it's defective, you need to replace it.



    You'll also need to check the wiring harness on the control board and check whether any component is burnt or not. If you cannot distinguish any faulty component then you'll need a multimeter. Check for the capacitors whether they are open/short circuited. Also check the motor wiring, it may be shorted with each other or the body of the machine.



    Please do accept thw solution and revert for further assistance.

    Thanks
    Rylee

  • Rylee Smith
    Rylee Smith May 24, 2009

    Hi



    The Touch Pad/LED Assembly is removed as a single assembly and is connected to the Central Control Unit by a ribbon cable. This assembly contains all of the buttons, LEDs and ribbon cable and printed circuit boards for the user to operate the washer. This interfaces the consumer inputs to the Central Control Unit.



    Check the Central Control Unit (CCU) is located at the top rear of the washer and is enclosed in a control box. There are no serviceable parts inside the control box. If any component of the CCU is defective, the entire control box must be replaced. The CCU receives input from the touchpad/LED assembly and directly controls the dispenser, drain pump, water inlet valves, door locking and unlocking solenoids, and heating element relay.



    Also check the Motor Control Unit (MCU) which is located inside a plastic control box located in the lower front corner of the washer cabinet. The control box is shown with the access door open.



    The Touch Pad/LED Assembly is removed as a single unit and contains the Push Buttons, LED’s, cable, etc. The buttons can be replaced separately. Begin by removing the cycle selector knob. There are eight tabs securing the Touch Pad/LED Assembly to the console. A flat bladed screwdriver will be helpful in releasing these tabs. Release these tabs in sequence from left to right around the Touch Pad/LED Assembly until all of the tabs are free and the Assembly can be lifted from the console.




    You can buy the CCU for your washing machine from this link--



    Whirlpool WFW9400SW00 Control panel





    Please do accept the solution and revert for further assistance.

    Thanks
    Rylee

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SOURCE: No Power at Control Panel

sounds like a fuse issue. check the fuses.

Posted on May 24, 2009

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