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Bosch SHU9915uc/u12 making noise

Bosch SHU9915uc/u12. Makes loud noise three seperate times during operation. Turning off power does not stop sound. Turning off water supply valve does. I cleaned inlet valve but no change. Diagnostic test shows 2 blinking lights normal wash and delicate cycle. What is wrong?

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Re: Bosch SHU9915uc/u12 making noise


I have a possible answer to your diagnostic test, see below, if this doesn't help, let me know, and I will provide more help!

SHU 991x/992x (Integra) MODELS
To start test program, press and hold both POWER SCRUB PLUS and REGULAR WASH program buttons, then turn unit on by pressing ON/OFF button. When program buttons are released, lights above them will flash. To end test program, press ON/OFF button.
To check program indicator lights (POWER SCRUB PLUS, SCRUB WASH, REGULAR WASH and RINSE & HOLD), press and hold each program button. When SCRUB WASH program button is pressed, CLEAN light also comes on andan audible tone (?beep?) also occurs.
To start testing, press both POWER SCRUB PLUS and REGULAR WASH buttons a second time. When testing has ended and a fault was detected, the following indicator lights will be lit:
POWER SCRUB PLUS = Heater fault
SCRUB WASH = Water filling fault (over or under filling)
REGULAR WASH = NTC (temperature sensor) fault ? note circulation motor stops shortly after it started during an NTC fault
To check for heater, high limit or flow switch problems, start testing until heating starts. Using a meter with a current coil, measure current going into dishwasher. If current is ~ 11 A, then heater, high limit and flow switch are OK. If current stays at ~ 1.5-2 A, then heater, high limit or flow switch are faulty.
If water level switch (f1) has failed (opened), SCRUB WASH light will come on and unit will continually fill and drain where testing won't be completed. If flow switch (e5) has failed (opened), water won't heat (to 150?F) and water won?t stop circulating. If NTC probe (f2/f4) has failed (opened), REGULAR WASH light will come on immediately and testing will end shortly after water has started circulating.
If more than one fault occurs, more than one light will be lit.

Posted on Jan 19, 2008

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Re: Bosch SHU9915uc/u12 making noise

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see this causes and fix it. God bless you
Drain Pump If the dishwasher is loud during operation, the drain pump might be defective or might have some debris in it. This is a common problem.
Circulation Pump If the dishwasher is loud during operation, and the noise is a continuous drone similar in speed to the circulation pump sound, it's likely that the circulation pump motor bearings have failed. Once this happens the circulation pump will have to be replaced, the bearings are not repairable.

Drain Impeller If the dishwasher is loud during operation, the drain impeller might be broken, or there might be debris in the pump. Generally, to gain access to the pump the top of the pump housing will have to be removed.

Pump and Motor Assembly If the dishwasher is loud the motor bearings, drain impeller or wash impeller might have worn out. All three of these components are part of the pump and motor assembly. It may be possible to replace one of the impellers, but the motor bearings cannot be repaired. In that case the pump and motor assembly will need to be replaced.

Wash Impeller The wash impeller is a small, plastic blade. The motor spins the impeller forcing water through the spray arms to clean the dishes. If one or more blades has broken off of the impeller the dishwasher is loud. The impeller can also scrape against the pump housing if it is damaged, warped or bent.

Circulation and Drain Pump Motor If the dishwasher is loud during operation, and the noise is a continuous drone similar in speed to the motor sound, it's likely that the circulation and drain pump motor bearings have failed. Once this happens the motor will have to be replaced, the bearings are not repairable.

Water Inlet Valve The water inlet valve is an electrically controlled water valve. When it is new, the water inlet valve is very quiet. Over time, the diaphragm inside the valve deteriorates and deforms. This deformation interacts with the water rushing in and can cause a loud vibration, buzzing, squealing or other noises. If the dishwasher is loud during the filling cycle, replacing the water inlet valve may solve the problem.

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My dishwasher(Bosch) makes sqeeling sound almost like beeping at the beginning of its cycle what is a problem?


Welcome to FixYa.

Based on your description " makes squealing sound almost like beeping at the beginning of its cycle " is likely to be either the pump impeller or the inlet valve.

With the Bosch built line of dishwasher`s this is a known problem...the carbon ring ( spring ) of the impeller pump seal kit. ( make sure it is indeed a SHU9915UC before ordering parts )

**Most common in units not used regularly, i.e. in a holiday cottage or vacation property, but time to time on daily used as well unfortunately...but also due to the heat from normal wear & tear**

You first must determine which is the source of course. Does the noise begin after filling with water and the pump starts, or does it begin upon the filling of water ?

If it's the valve, make sure the water supply line is completely "open" and if so replace the valve with part #425458



If it is the motor wash impeller squeeling It can be remedied by one of two methods, replacing the entire motor & pump assy part # 442548...



This retails between $99.00us. to as much as $170.00us. depending where you look. I usually go through "" for about $100us. ( you can also investigate "" or "" to name a few.

Or if you are mechanically inclined, replacing the pump impeller kit. part # 167085


The kit is typically around $50 -$75us, hence it can be cheaper when factoring labour for the complete motor/pump assy.

This is a pretty involved repair to explain, in fact I think it is harder to explain than actually do...but I`ve done many.

If you`d like to provide me with an email address I can attach a file in "pdf" showing you step by step how you can do this without much cost at all really...likely your time will be the greatest expense.

Let me know how you`d like to proceed and I`ll help in whatever manner I can.

Thanks for choosing FixYa and Good luck.


Macmarkus :)

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first sounds you hear will be the drain pump. usually rattling noises if something is in it but it can make a hum noise if something is jamming the drain propeller up. which is accessible with a T20 torx driver. take the filters out and the mesh filter. and unscrew the screw in the base towards the left. pull out whatever is lodged.

the other humming sound can come from the next component that activates is the watervalve. make sure you dont have a kinked water intake line. otherwise its a bad valve. i have had to change a few of those water valves out already but not for a hum noise on your model. you have a new style water valve. when brands make new parts we get problems fast sometimes..

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