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.

ensure your dishwasher pump and drain hose are unobstructed. If your machine does not drain it will not refill with fresh rinse water and since it can't do that the cycle will never finish.

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)

Mar 20, 2015 | Whirlpool Dishwashers

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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!

Oct 22, 2014 | Kenmore Dishwashers

1 Answer

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...

May 06, 2014 | Dishwashers

1 Answer

Whirlpool quiet partner 2 shuts off in mid wash cycle

A bit late to this but here is how I fixed my dishwasher for about $5 which was:
1. Randomly turning off during cycle
2. Not filling with water (I checked the pumps continuity which was good so I ruled that issue out)
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.

Apr 17, 2012 | Whirlpool GU2400XTP Built-in Dishwasher

1 Answer

Ran a normal cycle, opened the door afterwards to find a black tar like substance all over everything! What is wrong and how do I clean this stuff out of the inside of the dishwasher

I had that with my Kenmore Ultra Wash. I think is grease from a worn out or rusted out bearing. It also had an orangey stain making me think it was runsted out. I replaced the impeller assembly (cost about $30). Works a little better, but I fear the grease-gunk may have clogged up something else in the works.

Mar 24, 2011 | Kenmore PRO 24 in BuiltIn Dishwasher with...

1 Answer

We have put jet dry and changed soaps but it always leaves a white film on the dishes! No other appliances have problems with this in the house.

Thanks for your question. You may have a couple of problems, first if you are using jet dry it is a surfactant. Which means that it places a small amount of a chemical on you dishes to keep them from spotting. If your dishwasher is releasing to much this will cause a white coating on dishes. In the loading area for you jet dry or liquid spot rinse there should be a knob that is marked from 1-5 or so. First turn this dial all the way down to 1. This will reduce the amount of jet dry released. Then monitor the amount of jet dry that you are going through. You should be able to get about 60 loads from a small bottle of jet dry. The other problem may be that you have washed a item that was not dishwasher safe, like a plastic bowl or such. Some of these items will leech the pigment into your dishwasher and then onto you dishes.
I might suggest that you purchase some dishwasher cleaner from you local Store. Walmart and most box stores carry this in the same section that you purchase your detergent. You will need to empty the dishwasher, following the instructions on the cleaner insert into your dishwasher. Then run it through a complete cycle. After attempting these items please let me know if you still have an issue, but I am almost certain that you will have corrected the problem. Thanks D.R. Wilkins

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1 Answer

This is a 3 yr old dishwasher with very gentle use. It now is not cleaning glasses....even when rinsed before hand the glasses are still stained and spotted. Also my silverware needs to be completely...

Hard water stains are easily taken care of with the help of vinegar. Add 1/4 vinegar to the cycle when you start it and it will help to remove spots and cloudiness.
As for food residue you might check your filters and water pressure.

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