Question about Bosch 24 in. SHU5305UC Built-in Dishwasher

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Bosch Dishwasher Wont clean properly

I have a Bosch SHU5315UC dishwasher. It's about 5 years old. Over the last year or so, it has not been cleaning as well. There is residue left in the machine on most runs. I have cleaned the filters and this does not seem to fix the problem. Sometimes it will not complete the cleaning cycle, but most of the time it does. It has been suggested to me that the problem is that the water heater is not working properly, and that the machine is not getting to proper water temperature. Is this a likely cause of teh problem, and if it is where can I get an exploded view or service manual that will describe the procedure for servicing the unit.

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  • Anonymous Nov 07, 2007

    my dishwaser is nt disolving the tablet, its hot ,its spraying i have cleaned filters and checked bit where salt wounld have gone is full of water so i am at a loss at what to check next

  • Anonymous Dec 05, 2007

    I have had my Bosch Dishwasher for about 5 years as well. This past year it has done a poor job of cleaning. Recently it has been building up a huge amount of mildew and specials even after it has ran a full cycle. My dishes come out smelly and normally still dirty. The cycles do take a long time upwards of over 2 hours and the dishes are still wet afterwards. I have cleaned the filter and sprayed the unit with bleach and water to kill the huge build up of mildew. The dishes came out clean this time but still somewhat smelly.

  • red g Dec 17, 2007

    My dishes always have bits of food and residues left on. When they dry its like grit and worse than before I put the dishes in. The temperature seems to be ok it bakes on the dirt on. I have cleaned the filter at the bottom of the chamber and re routed the waste so it connects to the wast outlet lower down than before.

  • Anonymous Jun 29, 2008

    I have the same problem, after about 5 years it will not clean proper,

    the repair man said; it is hard water and to add viniger, it is slightly better, but not near as good as the first 5 years. I was ripped off by the repair person $350.00.

    Please help,???? I am ready to rip this german **** out of my house (I am German/American)

  • ilader Oct 19, 2008

    After eight years, dishwasher is cleaning poorly, and dirty water remains in the bottom of the tub.

  • Anonymous Nov 30, 2008

    I have the same problem, with the same dishwasher after 5 years it leaves a film on all dishes you can see it on all glassware. the repair man said; I should add a cup of viniger after 4 minutes washing/draining it is calcium and paid $ 150.00 needless to say it was a ripoff. I used viniger for 6 month I still have the same problem. Why did I have no calcium for 5 years???

    I thing it is soap resedue. Then when I wash without soap first time water in dishwasher is milky from the last wash, then I wash without soap again 2nd time and it is super clear telling me there is a rinse problem??

    Fred Gauer

  • Anonymous Mar 11, 2009

    my dishwasher was working perfectly, also about 5 yrs old and now there is water left in the bottom at the end of the cycle. i have cleaner filters and wonder if I should put some draino type of solution into the dishwasher to make it empty.

  • startravelle Apr 04, 2009

    dish washing tablets are not disolving and the dishes are dirty even on the hotest (pots and pans) cycle

  • startravelle Apr 04, 2009

    diahwasher tablets not disolving completely and dishes are not clean even on hotest (pots and pans) cycle

  • june41988 Apr 10, 2009

    Bosch dishwasher doesn't consistently clean all dishes;  some usually have food residue........



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Poor cleaning is generally caused by not having enough water in the tub, which is usually the fault of the water inlet valve. You mentioned cleaning the filters... which filters? Did you remove the valve and clean its screen/filter? If that screen gets clogged with debris (and they do) it'll choke off the water supply to the tub.

Posted on Nov 04, 2007

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I had an easy fix to this same problem of not cleaning dishes well. The spray arms would get clogged with food particles blogging the little holes so insufficient water was coming out. Taking the arms off, poking the food out of the holes and rinsing the arms out well solved my problem. The bottom arm simply pulled off and the upper arm has a plastic doo dad that takes a quarter turn to release.

Posted on Jun 29, 2011

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I had the same problem last week with my dishes coming out dirty. I read through the suggestions here and remembered that my Bosch front-loading washing machine had the same problems. Clothes came out smelling really bad after being washed. I had to buy a washer cleaner called Affresh and after one puck cycle it was a brand new washer. So I thought maybe the washer had the similar residue buildup in the hoses and parts. I used half of an Affresh Power Puck and ran an empty cycle on the maximum power. I was so scared and had tons of towels ready to mop the floor. But to my surprise, the dishwasher was brand new looking after! The bad odor from the washer that I previously attributed to the dirty dishes was gone! The dishes since then have been so clean!!! Wow!

Posted on Apr 03, 2010

I have fixed this problem using a solution found elsewhere (I can't remember where). I opened up the Dishwasher door and inspected the area of the control board associated with the three large relays that switch the heater and other high current parts of the machine. For the heater relay, one of the solder joints had degraded due to electromigration to the point that it was now a high resistance point. (looked like a cold solder joint, and had obvious voids where solder had migrated away) I reheated the joint, applied some fresh solder and wham! working dishwasher. The water was not getting hot due to not enough current running through the heater, and this produced all of the symptoms of long cleaning times, dirty dishes etc. This is actually the second major appliance I have fixed in this way in a few years. The first was a microwave where the transformer delivering current to the klystron also had a joint that failed from electromigration. A similar re-heat and solder fixed the problem. It seems that the manufacturers are not designing these solder joints with sufficient volume to prevent elctromigration over years of heavy current loading. Perhaps this is intentionally designed in failure, but it is interesting to see this show up twice in my very limited stable of appliances.

Posted on Dec 10, 2007

One more thing, use salt and rinse agent, 3 in 1 tablets are not really good for older machines. The dishwasher is designed to release the salt and rinse at different times within the wash, if you put it all in one tablet it all goes in at once. Save your money, in fact I saw a tablet the other day that was 5 in 1, i think it makes you a cup of tea also...

Posted on Dec 10, 2007

Yep me too, the water seems dirty and leaves a residue, that then dries onto the glasses and plates. Best thing you can do is try and raise the water out pipe up at the back, I used a hook behind the machine. The dirty water then gets pumped up and over the raise and down and out otherwise on older machines the water just sits in the pip and goes back in. Also buy some Caustic soada and run some through, this will clean the fatty deposits and hopefully help.
I used to party now I clean the dishwasher...

Posted on Dec 10, 2007

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There is a new product out called the dishwasher filtration system. it actually filters the water going into your dishes. the dishes look dirty because your water has a lot of calcium and magnesium in it making them appear cloudy or dirty. the dishwasher filter reduces those minerals and my dishes look perfect now. no more dirty and grimy looking dishes. i also dont waste time washing them by hand before and after the dishwasher. hahaha you can get it at use code DFMTEN and you will get 10% off. it fits right under your sink and is very affordable. you will be glad you bought this product. thanks

Posted on Apr 27, 2008

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I have a 5 year bosch shu43c05uc & my dishes aren't clean any more? i've cleaned the bottom lint container & it still isn''t clean? does my dishwasher need repair?

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