Question about Bosch 23 in. SHU33A Built-In Dishwasher

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Black spots on plastic items

After washing plastic items more often then not have black marks on themm, Apears like grease! Care is taken to ensure nothing is rubing agaist them. The machine is less then 2 years of age. DS

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  • Anonymous Apr 14, 2008

    Maytag washing machine leaves black marks on clothes (shape of "()").Mark is about 1" across.

  • ac man209 Nov 23, 2008

    shu9925 very small dark grey spots only on plastic items

    appears to be bearing grease.

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I have the same problem on my Bosch dishwasher Model # SHX33A05UC. It is about 6 years old. I have replaced three gaskets and it did not solve the problem. I am a 25 year mechanical engineer. I do not recommend anyone changing these gaskets on their own except for the long dishwasher door gasket (which goes along the top, left and right door edges) which is quite easy to replace. The other two gaskets, which were quite difficult to replace, were the gasket at the bottom of the dishwasher door and the sump pump gasket. I am still having the tar like black tiny dots depositing on my plastic tupper wear on the second shelf. I will likely not buy a Bosch dishwasher ever again. I will make my decision after hearing what Bosch tech support has to say about what I need to replace next. Could it be the rubber drain check valve not operating correctly? I need to find out. I have spent so much time trying to solve this black tar dot problem!!!

Posted on Jan 10, 2016

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Whirlpool dishwasher, quiet partner 1. Does not drain, does not finish wash cycle.


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Many people don't completely rinse off food stuffs from their dishware, expecting the dishwasher to take care of it. To be honest, a dishwasher is more of a fine cleaning and disinfecting device than a pot scrubber. Because of this, grease, food debris, etc can clog the pump or drain line over time. be sure to use a good de-greasing agent regularly once the flow of water has been cleared (don't wash your dishes with it however)

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We have a Kenmore Elite 630.16304401 dishwasher, lately we are getting small black greasy spots on the plastic dishes, also same spots on the plastic parts in the sump where you clean the filter? We h


A couple of thoughts:

1) It could be a gasket somewhere starting to break down. Check your door seal.

2) Food particles could have gotten caught somewhere in the drain hose, or something, and then turned black with mold and bacteria, then when you wash, they get siphoned back into the dishwasher if the flap which composes the anti-siphon check valve on the drain hose is starting to stick open.

Try putting a cup of bleach in the top rack and run a complete cycle with no other dishes in it. Then, load up some plastic dishes and wash them as normal. See if that helps. If it does, replace your check valve.

Also, insure that your drain hose is looped up above the bottom of your sink to prevent debris from your garbage disposal backing up into your dishwasher.

Good luck and keep us posted!

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Why is My new Bosch dishwasher leaving black marks on my dishes?


Is it perhaps coming off the racks? Are they black? Did they come with a plastic covering that has not been removed? Otherwise I would imagine it could be the rubber seals around the door. Have you tried wiping all around with a white cloth to try to establish where it may be coming from? Door or drawer?? If it is a drawer style unit, check the rollers are clean, they may have been over zealous when greasing them...

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A bit late to this but here is how I fixed my dishwasher for about $5 which was:
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3. After running diagnostics it would occasionally run a full cycle after I filled it with water manualy

I pulled out the Main Control Board W10084142, saw that 2 Capacitors (C131 & C132) were bulging at the top (not flat like the others) so I replaced them for about $5 and the dishwasher works great again! [** This does require very basic soldering skills]
whirlpool-quiet-partner-2-shuts-off-in-redpualzctszfotxpd4azbe1-2-0.png They are rated 1000uf at 6.3 volts and I was only getting a reading of about 150uf. Below is a link for about $5 replacements.
1000uF 6 3V 12 6x10mm Aluminum Electrolytic Capacitors 10 Pcs


How to get to the control board:
1. Disconnect Power Source at breaker panel.
2. Open Dishwasher door and locate the 6 hex screws that are holding in the control panel face on the backside of the dishwasher door. There will be 2 on each side of the latch and 4 (2 on each side) of the edge towards the top.
3. The face panel should pop off with a little bit of tugging
4. You will see a black cover, remove that to expose the control board
5. Ensure you label the cables with tape or something prior to removal, some require a bit of tug-and-play but will come off. For example, I labeled black wire with white stripe with a + and all black with a -. Ensure you label the control board components if you cant remember where the black with white stripe goes and vice-versa.
6. There will be little gray plastic clips holding everything in, locate these and slowly pry away the board from the plastic.

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