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 Moderated by: RegUS_PatOff, BrntToast, appl.tech.29501 Search Our Sites for More Info! Page:  First Page Previous Page  1  2  3  Next Page Last Page  
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MCU For Whirlpool Duet WFW9200SQ02  Rate Topic 
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 Posted: Mon Mar 15th, 2010 09:23 pm
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appl.tech.29501
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how long have you had this unit in place?



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 Posted: Mon Mar 15th, 2010 11:05 pm
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philipswanson
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I bought it used about a month ago from a lady that had changed the CCU twice.  I notice that on the 3 blue wire connector at the MCU has one prong pushed back that is not making contact.  Problem is, you cannot buy just this wire or connector.  I am thinking about parting this washer out because it is less than a year old and I will spend more on it trying to fix it than a new one would cost.  Already have $400 in it and it still won't even run.  Is there a way to tell if it is the MCU vs. a wire? 

Thanks, Phil Swanson

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 Posted: Mon Mar 15th, 2010 11:09 pm
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appl.tech.29501
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you should be able to still read voltage through the harness , you may have to pierce the harness with a needle or something that you can connect to your meter lead and confirm a signal...if you just need the 3 wire harness i probably have one laying around my shop.



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 Posted: Mon Mar 15th, 2010 11:43 pm
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philipswanson
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I had another 3 wire harness too but it was from an older Duet Model GHW9400 and that one didn't work at all, even though it looked very similar.  It had the same keyway, 3 blue wires but was slightly different.  It wouldn't even power up with that wire in it. 

If you have one from another WFW machine, I would be more than happy to pay you for it.  And yes I will do the voltage tests.  On those terminals, it seems like if one prong on one side is bent, then the other side of the same connection would work if it makes good contact.  I guess it still might be a fried MCU though.  That has never been changed and the motor has never moved or tried to since I have had it.  You can reach me at : woodyman1@sbcglobal.net with your info so I can send you the check for the wires. 

Thanks, Phil Swanson

 

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 Posted: Wed Mar 17th, 2010 06:22 pm
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philipswanson
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Does anybody have a good used 8183196 MCU for my Duet WFW9200 or offer a repair service for this board? woodyman1@sbcglobal.net

Thanks, Phil Swanson

 

 

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 Posted: Wed Mar 17th, 2010 06:42 pm
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appl.tech.29501
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Shouldn't start a new topic for the same issue....

I take it you don't need the 3 wire harness?

Fixyourboard.com



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 Posted: Wed Mar 17th, 2010 08:45 pm
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philipswanson
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Yes, I still need the 3 wire harness.  But want to change out the MCU as well.  Do you also have one of those?

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 Posted: Thu Mar 18th, 2010 12:27 am
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appl.tech.29501
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no, but i will check on the harness tomorrow.



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 Posted: Thu Mar 18th, 2010 12:40 am
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philipswanson
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I am more interested in the MCU.   I think that is my issue.

 

Thanks, Phil 

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 Posted: Thu Mar 18th, 2010 02:45 am
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Samurai Appliance Repair Man
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appl.tech.29501 wrote:
Shouldn't start a new topic for the same issue....

Indeed!

Topics merged.



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 Posted: Fri Mar 26th, 2010 12:41 am
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philipswanson
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I changed the MCU and the 3 wire blue harness.  Again, no change. Still get a flashing F28 error code.  I have changed the CCU, MCU, R/H interface and harness.  Still no drum movement.  Powers up, does diagmnostic check, runs the pump when clean is selected but that's about it.  I have already put over 350 bucks into this machine and still hasn't moved!  What's next?   Is there a voltage check I can do before I go out and buy more stuff?  At least I have collected allot of good spare parts. Thanks, Phil 

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 Posted: Fri Mar 26th, 2010 12:51 am
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appl.tech.29501
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Do you have the unit on a circuit by itself and is the polarity of the outlet correct as well as grounded?



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 Posted: Fri Mar 26th, 2010 01:19 am
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Check that the serial harness at the MCU is not mounted upside down.


The wires should be to the left when facing the MCU connectors.



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 Posted: Fri Mar 26th, 2010 02:36 am
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philipswanson
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appl.tech.29501 wrote: Do you have the unit on a circuit by itself and is the polarity of the outlet correct as well as grounded?
How can you have polarity on AC?  The polarity changes 60 cycles per second.  Yes it is properly grounded but not on a circuit by itself.   Thanks, Phil

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 Posted: Fri Mar 26th, 2010 02:38 am
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philipswanson
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RegUS_PatOff wrote:

Check that the serial harness at the MCU is not mounted upside down.



The wires should be to the left when facing the MCU connectors.


This is not my issue.  Wires point to the left.  Saw this in the manual.  Thanks, Phil

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 Posted: Fri Mar 26th, 2010 02:48 am
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philipswanson wrote: ..  How can you have polarity on AC?  ..
make sure the large Blade of the Outlet is Neutral

and the small Blade of the Outlet is Hot

and the Ground pin is connected to ground.



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 Posted: Fri Mar 26th, 2010 03:12 am
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appl.tech.29501
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If the polarity is incorrect the communication will be whacked and the unit should be on a 20 amp. Circuit by itself...gotta love modern technology



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 Posted: Fri Mar 26th, 2010 07:14 pm
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philipswanson
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I pulled the outlet to double check polarity and the white neutral wire is connected to the wider spade.  It is a GFI outlet which has not popped all this time.  Also any other items on the same circuit have not been run while troubleshooting the washer and the breaker has never popped either.

I ran through the grounding schematic and all ground switches and ground wiring is working including the 2M ohm resistance through the MCU.  Also installed all new harness between the MCU and the CCU and between the R/H Interface and CCU.  Installed 3 different CCUs and two different MCUs.  Installed new R/H interface. All this has had absolutly no effect on the F28 error code and drum has never moved.  Clean washer function works with drain pump turning on and off.  Beginning to think the motor is burned out.  It has never moved at all.  Going to do motor resistance test next.  Any other suggestions?  I think it is a simple fix because I have done all the hard stuff.  What would you guys do next? 

Thanks, Phil Swanson   

 

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 Posted: Fri Mar 26th, 2010 11:03 pm
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appl.tech.29501
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Kick myself in the ass for dumping all that money in the washer ;)

Try the resistance test at this point what do you have to lose ?



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 Posted: Fri Mar 26th, 2010 11:27 pm
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appl.tech.29501 wrote: ... Try the resistance test at this point what do you have to lose ?
would have been one of my first tests since Motor doesn't run and checked Harness continuity ..



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