Question about Bosch 23 in. SHU 8805 Built-in Dishwasher

2 Answers

Bosch Dishwasher Hums But Doesn't Start

After making more noise than usual our Bosch dishwasher SHU8805uc/14 no longer works. When we select a cycle, press the start button and close the door, the unit only faintly hums: no water enters the unit and it sounds like no moving parts are working. There is no water in the pan below. If I press and hold scrub and regular buttons and press start and close the door, sometimes water begins filling the unit for a couple of seconds and then it stops and just hums. Once when doing this it sounded as if the motor began to run for a few seconds and then stopped, again only a faint hum. If I do it again, sometimes the unit will drain the water from the previous test, but will not run. I pulled the unit out, took off the left panel to expose 2 micro switches. If the unit is set to cycle and turned on I can get it to fill up with water by activating the switch attached to a white translucent vessel. If I then activate the red float switch the unit drains. I observed no leaks.

Posted by on

  • 2 more comments 
  • craig821 Jun 18, 2009

    Thanks for the reply, but "If the unit is set to cycle and turned on I can get it to fill up with water by activating the switch attached to a white translucent vessel." Doesn't this mean that the water inlet is not blocked and that the solenoid is working?

  • craig821 Jun 19, 2009

    Thanks for your help! I am now getting a clearer understanding of where the problem lies!

    The image you show here is indeed what I was refering to as one of it's parts being a white translucent vessel (I was referring to the white translucent disc with the blue piece of plastic which resembles the shape of a question mark), except that your image is rotated 90 degrees counterclockwise from the actual condition.

    Because I was troubleshooting before with a malfunctioning unit, it is now apparent that I wasn't starting a cycle from the beginning. Ok, If I start with dry unit and engage a new wash cycle water indeed enters the unit and fills until the blue piece of plastic turns the water off. So far so good.

    Now the faint hum begins. There is no sound of "washing". Having worked with small electric motors before, this hum sounds like a motor that is not spinning, just humming. It hums for about 20 seconds and then stops for about 15 seconds, then it hums again and then stops, and so on. I assume that the stopping is a safety tripping and then resetting.

    If you agree so far, is the problem the motor or what it is trying to operate (a pump?) and are either of these likely to go bad? Please recall in my first post that the unit began to make alot of noise as soon as the washing started, thereafter it stopped working.

  • craig821 Jun 19, 2009

    I thought that we were narrowing the problem down to the motor and the pump...I agree that the controller could be the problem. But if it is the controller, then that leaves a couple of questions!

    What impact do you think the controller has had on the screaching noise during the motor operation before the unit failed?

    If the controller has failed, what is humming sound now after the unit is filled with water?

  • craig821 Jun 20, 2009

    How do you access the impeller & motor? From the left side, right side, back, front, bottom, or from inside the washing chamber? Do you have a picture or diagram that you can share?



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Bosch Master
  • 19,396 Answers

If this happens at start of the cycle, then it is likely a problem with the water inlet system.

First thing to do is accessing the back of the machine, with power unplugged.

Check the water supply hose, and ensure that water is flowing inside the machine. If the inlet hose is OK, then the problem is likely the inlet valve.

Access the inlet valve and remove hose from valve. Check if hose or valve is blocked. If there is no blockage , then the valve is probably faulty.

the valve can be tested first reading ohms at the solenoid contact with a multimeter, and energizing the valve to see if it close and open. Also reading valve volts can tell you if problem depends on valve or timer control board.
The last two test involve reading values and operating valve with live power. For safety reasons they must be done by an experienced repairer.

You can find parts and diagrams for many appliances here.

If this comment had been helpful, then please do not forget to accept the solution.

Many thanks.


Posted on Jun 18, 2009

  • Ginko
    Ginko Jun 18, 2009

    If the inlet valve is opening under certain conditions then the valve is fine.

    The translucent vessel you are talking about must be tha water level switch.

    Under normal conditions the water level switch closes the inlet valve and opens the drain pump when an overflow is detected.

    In your case it looks like the water level sensor is defective, and is closing the inlet valve from start, wrongfully detecting overflow even when there is no water.

    The humming noise can be the drain pump operating with no water inside the machine.

    Here is the water level switch:




  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 6,784 Answers

Hi.this seems like a multi-dimensional issue but, its just a control fault. the control unit has failed. the logic chip set is damaged. these chips are responsible for initiating the correct wash sequence. this control unit should be replaced in order to restore normal function to your unit.

Posted on Jun 19, 2009

  • 2 more comments 
  • Michael Masters
    Michael Masters Jun 19, 2009

    The Control Unit will cost about $105.00

  • Michael Masters
    Michael Masters Jun 19, 2009

    This humming and screeching can be caused by an foreign object that has successfully traveled and made it passed the chopper or filter, into the wash or drain impeller. this will jam the impeller temporally. you can remove the sump or pump housing to check for this type of interference if you choose to but, this is totally unrelated to the original issue. you may have two issue here but, the main is the control unit. the actual control can cause a slight hum if the circuits are damaged.

    It controls the initial actions of every electrical parts that are housed in the unit. it is responsible for switching the valve and motors as well. if this unit is faulty, it will cause the hum in the motor, due to a failed relay circuit.

    I suggest you inspect the circulation motor. remove the housing and, look to see if the motor is jammed. try to move the drive with your finger. if it moves freely, it may just be a foreign object that was caught in the housing. I doubt this but, the inspection will rule it out.

    I recommend inspecting the drain pump as well. most units will have a motor set up that will incorporates a single motor that will have to impellers attached. one is the wash and, one is the drain. if this is the case, the test will be simple.

    FYI, The previous expert didn't respond to your last post so, the issue was forwarded to my board. i assume the previous expert was a bit overwhelmed. i do not have access to your previous encounter with the other expert. You stated we were chatting about other issues and not the control. this must be a mistake. that chat was with the previous expert that didn't finish this chat.

  • Michael Masters
    Michael Masters Jun 19, 2009

    Concerning the Motor. If this jam is significant, the control will prevent further damage by throwing a protect switch. this will kill the entire unit. during the inspection, if you detect any impeller damage, replace the failed impeller and drive as well. if its very severe, as soon as you remove the housing, the impeller may fall out. In most cases, small pieces of glass will get jammed and, this will cause the motor to strip the center stud. this will cause loud noises and trip the protect mode as well.

  • Michael Masters
    Michael Masters Jun 20, 2009

    Your main concern will be the circulation motor. this is what you want to inspect. its housed in the pump housing on the bottom on the unit.there is a picture of the pump with the upper case attached below.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have a SHU5305us/u12 and my front door lettering got erase. anyone have a picture or a manual that tells me what each button means.

Cycle Interruption

As a safety feature the dishwasher will automatically turn itself off whenever the door is opened. However, if the door is opened quickly while in a wash or rinse cycle some water may splash out of the dishwasher. For this reason it is recommended that the machine always be switched off before opening the door.

To Interrupt a Cycle

1. Press the on/off button to stop operation.

2. Wait at least 10 seconds (or until the water noises stop) before opening the door.

To Resume a Cycle

1. SHU/SHI models, close the door and press the on/off button.

2. SHV models, push the on/off button and close the door.

Changing a Cycle

For Bosch dishwasher models SHI 6800 and 4320, SHU 5300, 5310 and 6800 press the program button of the desired cycle TWICE. For all other Bosch dishwasher models, press the program button of the desired cycle ONCE. The chosen cycle button (or the light above it) becomes illuminated, showing that it has been selected.

* SHU 3030 and SHU 3130 models do not have program lights.

Cancelling a Cycle

Each control panel shows which buttons to simultaneously push to cancel a cycle. Refer to your dishwasher to find the cancel drain buttons on your particular model.

1. Press the indicated buttons at the same time and hold for approximately 3 seconds.

2. When the drain pump noises stop and the LED display or clean light indicate that the end of the cycle has been reached, the dish

washer is reset.

3. Press the on/off button to turn the dishwasher off.

4. The dishwasher is now ready to run a selected cycle. Add more detergent if necessary.



Oct 05, 2015 | Bosch Dishwashers

1 Answer

How do i operate a basic bosch dishwasher

On many Bosch dishwshers (especially those with the controls on top), they expect your to press the appropriate cycle and option(s) buttons, and then press the Start key, ALL WITH THE DOOR OPEN. Immediately after pressing the START button, close the door (within 3 seconds), and the dishwasher should start.

On other Bosch dishwashers, if you open the door, the poser button is automatically turned off. On those models, you must close the door, turn the Power button ON, and THEN press the appropriate cycle & options buttons. If your dishwasher has a START button, then press it; otherwise just wait 10 second with the door closed.

See? There is no such thing as a "basic bosch dishwasher". Next time, if you have a question, please provide the model number of your dishwasher (or other appliance).

Mar 20, 2015 | Bosch Dishwashers

1 Answer

Bosch dishwasher has a buzzer on all the time .

I'm not sure if you mean it is buzzing because of a fault or if it buzzes to say the program has ended and you want to switch this off??? if it is the later the following should help

To activate any of the Dishwasher Options listed, follow these steps:

Open the dishwasher door far 1. enough to expose the control panel.

2. Press the On/Off button.

3. Press the MENU/OK button until the desired option appears in the display window.

4. Press the - or + button to step through the available option settings.

5. When the desired setting is shown in the display window, press the MENU/OK button to save the setting. The display will indicate "Value Stored" and return to the main

menu. If you did not change the setting, press the start button to return to the main


6. Select the desired wash cycle by pressing the - or + buttons.

7. Press the start button and close the dishwasher door to begin the cycle.

NOTE: In the Options Step Down Menu, you can return to the main menu at any time by

pressing the START button.

Feb 20, 2013 | Bosch SHX98M0 24 in. Built-in Dishwasher

1 Answer

My new bosch axxis washer was20160uc does not start

Open the dishwasher door if the desired cycle does not perform as selected on the control panel. Press the main power switch "Off" and then "On" again. Select a cycle, press the appropriate button, press "Start" and close the door. Make sure the door is closed completely.

Check the circuit breaker and water supply if the dishwasher does not start after selecting the appropriate cycle on the control panel and shutting the door.

Turn "Off" the dishwasher and disconnect the dishwasher from the power supply if an error code between "E01" and "E30" appears on the digital display. Reconnect and turn the dishwasher "On." This should reset the control panel.

Terminate a program on the control panel by holding the "A" button and pressing "Start" at the same time. The display will read "0:01". Close the door to start the program sequence. The display will read "0:00" when finished.

Oct 15, 2010 | Dishwashers

1 Answer

Burning plastic smell, big flash & now its dead - Bosch SHU8805UC

remove the water and, the burnt plastic that probanly melted on the dish drying heater coil
close and, lock the door turn the dishwasher back on and, reset the circuit breaker to see if the motor will run or, is damaged

Jul 01, 2009 | Bosch 23 in. SHU 8805 Built-in Dishwasher

2 Answers

Bosch Dishwasher will not power on

I saw my repair man do the following, which you might try...
Open the door and simultaneously press & hold down the power button with the 2 buttons used on your model to "Cancel & Drain." If the unit comes on it now is in self-diagnosis mode. Release the buttons and close the door. The unit should start to fill with water. Press the power button to exit the mode.

Jun 28, 2009 | Bosch 24 in. SHU53 Built-in Dishwasher

1 Answer

Kitchenaid dishwasher sucking noise when ON

the sucking noise is the water valve, opening but it doesn't not sound it getting any water in. have the water valve replaced.

do you get any error messages on the display?

Sep 13, 2008 | KitchenAid 24 in. KUDS01FLBL Built-in...

1 Answer

Bosch Dishwasher stuck in "Scrub Cycle"

The Control module on our SHU43 blew this morning and when I took it apart to get the module out, I discovered why two of the Cycle selections no longer worked..... the little plastic lever that pushed the switch behind the fascia button - had broken off. You may have the same issue. It's not a cheap fix though as a new module is gonna cost me $175.

Mar 25, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

Not finding what you are looking for?
Bosch 23 in. SHU 8805 Built-in Dishwasher Logo

Related Topics:

2,945 people viewed this question

Ask a Question

Usually answered in minutes!

Top Bosch Dishwashers Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Gerry Harvey
Gerry Harvey

Level 3 Expert

1467 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18408 Answers

Are you a Bosch Dishwasher Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides