Author Topic: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle  (Read 8540 times)

Offline qman

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This dishwasher has been absolutely fabulous all the years we've had it but recently it just hasn't been doing the job.  Intermittently, the dishes look clean when the washer finishes but they have a gritty feel to them.  When this happens there is usually some grungy looking water in the bottom and sometimes there is quite a bit of water in the bottom.  So yesteray I ran a complete cycle and paid attention to it all the way through.

I believe the dishwasher usually has 3 stages to a single clean cycle. I believe the first stage is a water only pre-wash. The second stage is the soap wash (usually the longest stage) and third is the rinse. Today I paid attention to a complete cycle and it seemed that the unit used the same water all the way through. During the initial stage the water is usually the dirtiest. With this particular load, the water in the initial rinse stage had a pinkish strawberry milkshake look to it. Shortly after the second soap stage began, I opened the unit and noticed that water looked the same as it did during the initial stage. It had the same pinkish milk shake look. I was sitting on the floor when the soap stage finished. It began to drain but didnít completely drain all the dirty water. It only drained for a few seconds (probably less than 15 seconds) and than began what I believe was the 3rd stage, the rinse, using the same dirty pinkish milk shake water. While it was draining after the second stage, I could feel hot water in the drain hose and in the sink drain pipe so I do not believe there is a clog anywhere in the line. It just didnít drain for very long. What would make the unit act like this? I like conserving water but not like this.

BTW, the water level was up around the top of the microfilter screen that screws into the bottom of the unit. This looks correct but I threw it in here just in case it isn't right.

Again, this problem is intermittent but happening more and more often.

Also, I read this thread:  http://appliancejunk.com/forums/index.php?topic=2583.0
I don't seem to have and underfilling problem.  It just seems like this dishwasher forgot that it should change out the water between stages of a wash cycle.

Offline qman

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Re: Bosch SHU9925 Dishwasher Using Same Water through entire cycle
« Reply #1 on: December 27, 2008, 06:05:26 AM »
Sorry, I titled this thread incorrectly.  It should say "Dishwasher Using Same Water"

Offline JWWebster

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #2 on: December 27, 2008, 09:46:43 AM »
Remove the pump filter and clean out the sump If you have something in the impeller it must be cleaned and objects removed. Kill the power and pull the unit. Get out the assembly and clean it. I have your dishwashers service manual in my computer but I do not know how to post it. Perhaps AJ can help.
« Last Edit: December 27, 2008, 09:50:24 AM by JWWebster »
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Offline qman

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Offline Repair-man

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #4 on: December 27, 2008, 11:32:34 AM »
Yes, it will cover the basics. There  is another Bosch post that shows the water distribution on the left side of the unit:

http://appliancejunk.com/forums/index.php?topic=2583.0
« Last Edit: December 27, 2008, 11:34:34 AM by Repair-man »
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Offline qman

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #5 on: December 27, 2008, 12:23:38 PM »
What do you mean get out the assembly?  Do you mean the impeller assembly?

Offline JWWebster

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #6 on: December 27, 2008, 01:01:49 PM »
Yeah that is the manual it says 9925 on the 1st page. On page 15 0f 37 in this manual it says do not remove the pump, get the screen off the sump and reach through it to the impeller and get the crapola out of it. Well it didn't say crapola but you get the jest.
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About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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Offline qman

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #7 on: December 27, 2008, 01:08:31 PM »
Alright, I pulled the drain impeler out and it is clean.  It also turns just fine  All hoses and water flow parts are also clean.  There is no blockage.  The impeller is on the left side of the sump and there is some kind of motor on the right. I'm guessing this motor is the water flow motor for getting water up into the unit.  I only looked at the impeller, not the motor.  It looks like removing the motor is a real big job.

Is it possible that the controller has lost it?  I say this because sometimes it works perfectly fine and other times it doesn't.  It started to drain and then stopped.  To me its acting like its brain is fried.  Kinda like I would after a 2x4 upside the head.  Just wondering.

Another thing.  When I removed the door, the inner door is coated in some thick, heavy, black tar-like gunk (I guess soundproofing).  Anyway, the black/white wire (ground?) to the controller looked like it had melted into the black tar stuff.  There were a number of wires in the harness there but only the black one was into the black stuff.  Does that mean anything?

Offline qman

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #8 on: December 27, 2008, 02:49:43 PM »
I pulled the dishwasher out, removed the left panel and ran it.  This is water level control unit in my washer:

http://www.repairclinic.com/SSPartDetail.aspx?s=t-shu9925uc-%3d%3di935595&PartID=935595

In the picture the unit is upside down from how it is mounted.  If you'll notice, in the center is a cylindrical chamber that unit has a red thing in it.  I believe the red thing is a float of some type.  Hanging over the edge of this chamber is a candy-cane-shaped piece of plastic (about as round as a straw) that hangs over the side.  Kinda how a candy cane would if you hooked it onto a glass.  I think the way it is supposed to work is the chamber fills with water and the red float rises.  If it rises high enough, it pushes up on a candy cane shaped plastic that depresses the drain impeller motor.  I can lift the candy-cane-shaped thing by hand and it pumps out fast.  But as I sat there and watched it, it only pumped for 4-5 seconds real fast and then slowed way down for a few seconds and then quit.  Then the second wash stage began.  Anyone have any ideas?

Here's how I observed the washer working.  It begins by allowing water in.  Once enough water enters the unit it begins to run.  I can hear the wash arms spinning and spraying.  Water continues to flow into the unit until the proper level is reached.  I was watching the red float and noticed that it started to rise at the beginning and when the unit started to spray water, the water level in the float dropped because there is now water being circulate up into the washer which makes for a lower level in the bottom.  I think what is supposed to happen is that when it is time to change wash stages, the unit stops circulating water, the water level then rises, pushing the float up into the candy-cane-shaped thingy which then engages the drain impeller switch.  This is only happening for a short period of time and never emptying the unit.  It then starts up on the next stage with the same water that it ended with.

Offline JWWebster

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Re: Bosch SHU9925 Dishwasher Not Using Same Water through entire cycle
« Reply #9 on: December 27, 2008, 03:26:30 PM »
Can you see why it is important to clean out the sump?
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        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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