Question about Bosch 24 in. SHU43 Built-in Dishwasher

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Bosch shu3036 upper arm with low pressure

Dishwasher shu3036us/uc12 doesn't get upper rack clean. Arm moves infrequently and I suspect lack of water pressure.

Opened the unit and saw black gasket material inside the water valve assembly blocking about 25% of the inlet screen. Cleaned it out. (Not sure where that would have come from.)

But is this more of an impeller problem? Do I need to rebuild the circulation pump? Replace with a new one?

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Re: Bosch shu3036 upper arm with low pressure

I don't have a solution. I also have a Bosch SHU3036 dishwasher. It is 8 years old and last Thursday it stopped heating and the rinse cycle ran for hours before I noticed it in the middle of hte night. Two repairmen who came yesterday (got them off the Bosch website) seemed to have no clue. Does anyone have a suggestion?

Posted on Feb 06, 2008

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Re: Bosch shu3036 upper arm with low pressure

Check water level should just appear above filter failing that a common fault on these is the impellor wings have worn you need to strip wash motor down to get impellor cover off

Posted on Jan 07, 2008

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Why doesn't my Bosch SHU43 c06uc dishwasher have any cleaning force?

With your dishwasher empty, roll out the bottom rack. The feed line for the upper spray arm runs from a pump outlet directly behind the lower spray arm spindle. This tube runs up the back wall of the dishwasher and mates with the upper rack when it is pushed in.

This feed tube simply snaps into place in the bottom of the machine. It is a high pressure line that makes an immediade 90-degree bend towards the rear of the unit. They have a tendency to pop out. When and if it does pop out you get almost no water coming out of the upper arm and you lose effective pressure in the lower arm, too. The cure is to push that feed tube back down firmly into the port until you hear it snap into place. While you have the lowere rack out it is a good idea to clean the intake screen out and check for any debris in the intake well.

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1 Answer

Dishes on upper rack are not being cleaned. Seems like upper sprayer is not working properly.


Please check if something is blocked near the top spray arm, also make sure that all holes are oopen. Use a sharp metal pin to clean the holes on the top spray arm. Make sure the water pressure is not low.
under the screen and youl'll need a Torx driver to get to it after you remove the spray arm and screen. Check to see that the path it travels is clear. I have seen these get blocked up by stuff.
Now check if the top arm spins freely and check the bearings for the arm, if they are producing extra friction while the spray arm spins. Hope this helps... Please post back if you need more assistance.


Jan 01, 2011 | Bosch 24 in. SHU43 Built-in Dishwasher

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The top rack dishes are not getting clean. the spra arm is clear and the tube supplying water to the arm is clean. the float is also moving freely.

does this have the water conduit tube going up the inside of the rear wall where you can see it,if so,the conduit "horn" where it connects to the tube that feeds water to the upper arm with repeatedly opening and closing this horn wears out and lets water get past here and lowers water pressure to the upper arm

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I removed the lower spray arm, and then the filter. I found that there was a lot of buildup under the filter area. I scraped the buildup off. I found that it was restricting the input of water flow to the pump

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Bosch dishwasher - top row of dishes do not get clean

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<a href="">St Paul Appliance Repair</a>

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Only washing top rack

After observing the water just gushing out when the spray arm was removed, we determined there was still a bunch more calcification/soap in the ends of the spray arm. (We have very hard water in our area). Unfortunately, you cannot open up the spray arms to clean them out, so it took about 30 minutes of pounding and manipulating to get all the gunk out. Now my dishes are clean again. Hallelujeh! And the water cleaning the dishes is cleaner, as well.

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1 Answer

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I had similar problem. the problem was due to having not enough water pressure in the line to the upper srapy arm. Did the following:

1. removed debris from sump assembly;
2. removed wash motor and clean clogged separation screen; and
3. sealed with Teflon tape manifold and probe manifold of the upper sray arm.

If you google for 'whirlpool 8178022' you should be able to get KD-12 repair manual.

Goof luck.


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3 Answers

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only the top rack isnt getting clean?
there is a little plastic circle in the middle of the bottom of the upper spray arm. turn it counter clock wise to pull the upper spray arm from the upper rack. make sure that isnt clogged and the spray holes are not clogged. otherwise....

the piece that the bottem spray arm plugs into and runs along the back wall of the tank to the top is called a feed tube. pull the bottom spray arm out. now you can see the part of the feed tube that feeds the upper spray arm water. does it pop out freely and easily? if so then you need a new feed tube, if not then its most likely your not achieving the right water level or your impeller connected to your circulation pump(motor) is clogged not supplying enough water pressure to travel up the feed tube to spin the upper spray arm.

Jul 13, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

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