Question about Bosch 24 in. SHU53 Built-in Dishwasher

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  • jerryselec Apr 30, 2010

    i took the float switch out and both no/nc functions are working.What is the sequence of events ? After the start button is pushed , should the water valve open imediately?

  • jerryselec Apr 30, 2010

    float switch works both no/nc functions operate. Should the water valve open right after the motor comes on ?



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OK. above please find, the real service and repair manual for your dishwasher this is the manual, used to train engineers to repair your item. Above that is a user troubleshooting guide.
The above two links are for DIY help sites, between these manual and DIY sites I am sure you will be able to troubleshoot & repair your unit, in no time.
If you determine that you need a professional, please contact, your local Bosch service representative, use ONLY a Bosch approved service center/man. This way you are assured of a professional and quick repair.
If NO power at the "Water Valve" Please check, first if there is power on those terminals, and work back.until you "Find" it again. But the service manual, will zero you in...

Posted on Apr 30, 2010

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Even if the switch is clicking, and the float arm is moving, that does not mean that the float switch is working.

The water level switch can be tested in two ways.

the first one is jumping the switch, and taking care of not overfilling by manually stopping the cycle. For safety reasons this test must be done by a trained technician.

Other way to test the switch is by reading Ohms with multimeter set at Rx1 on the switch terminal while operating the switch. The switch must be disconnected from rest of wiring first.
If the switch is opening and closing the circuit, then it is good. If there is no continuity, then it is bad and inlet valve will not get powered.

If the float switch is OK, test the door lock switch, and find out if there is any pressure switch to test. Bosch dishwashers have a pressure switch located at the bottom of the appliance, on the drain lines.

If everything is Ok, then a tech will need to read volts at the electronic control board contacts.

Disconnect power before performing any testing or maintenance operation on the appliance.

All tests must be done by a trained technician.

To get a technician on site , or to get a quote on repair ring the number listed on the owners manual.You can also get an US technician contact using our directory:Contacts.

To get parts ring the manufacturer at the number listed on manual.

You can also use one of the websites listed here to get parts and diagrams:

Where do I find parts and diagrams for my Appliance?


Posted on Apr 30, 2010


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1 Answer

Why does drain motor start when pushing the start button on the door before the door is closed?

It's almost certainly the float switch in the bottom of the machine. In the bottom is a polystyrene 'float' that is either active due to water in the bottom or is faulty. Tip your machine to the side and remove water and try again, bridge or replace switch is also an option

Jul 07, 2013 | Bosch Dishwashers

6 Answers

Dishwasher won't start

Try resetting the unit by shutting off the circuit breaker first for 1 minute then try the reset button. If nothing happens, then i would recommend having someone take a look at it.

Feb 09, 2008 | Maytag MDBH945AWW / MDBH945AWQ /...

2 Answers

Bosch Dishwasher won't fill with water

Certainly *sounds* like the float is stuck in the over filled position
or possible a bad float switch, if the float is stuck in the up or full position, the d/w will not fill with water and the drain motor will often run all the time

Jan 23, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

1 Answer

Dishwasher will not fill with water when turned on

Hi and welcome to FixYa, I am Kelly
The following steps require using electrical power. You assume all responsibility / risk for any mis-fortunes cause by working on this dishwasher with power applied.

The first step will require using a meter on the water valve solenoid teminals.
- Remove all power.
- Remove the lower toe / kick panel(s).
- Locate the main water supply line and follow that to the inlet water valve.
- Slide the connector(s) off of the solenoid and read resistance on meter scale R x 1 or R x 10. You should read a low resistance. If you do not read any resistance the inlet water valve has failed.
If you do read resistance you must check switch the meter to AC voltage and apply power and read for AC voltage on the teminals of the wire harness.
- Start a reular wash cycle to where the unit should be filing with water.
it SHOULD read 120 VAC.
If you have no power at the connector teminals
- Check the float switch plastic FLOAT. If the float is stuck in the UP position due to food particulate on the FLOAT stem you willnot have power to the inlet water valve solenoid.
If you have power to inlet water valve solenoid and it is buzzing / humming but you get no water there is debris in the main water supply line. You wil have to shut off the water supply and clean out the inlet of the water valve.

The inlet water valve replaement part is here:
Detailed View

This is what the float looks like:

This is the level switch assembly:

This is the actual Float switch: (3 terminal) POWER to the inlet water valve solenoid comes from this switch.

Check for s stuck float... and that the level switch is actuated as the float id lifed gently up and down. If you do not hear a micro-switch click the switch is bad. If the float is hard to move... clean it as best you can so that it moves freely up and down.

One of the above is causing your problem.

Thanks for choosing FixYa,

Jul 27, 2011 | Bosch SHU9915UC Dishwasher

1 Answer

Power goes to dishwasher, buttons lite up, does not run and no water starts.


When the Dishwasher is not filling in, you'll need to check for the water inlet valve, the filter screen and the float switch/assembly. Also check for the float assembly inside the dishwasher. When water is filling your dishwasher, a float rises along with it. As the float reaches a certain threshold level, it shuts off the flow of water, thereby preventing a leak. Sometimes the float can get stuck in the wrong position in your dishwasher, and it can prevent your dishwasher from filling. Sometimes it can happen due to float valve and on other occasions due to float switch. Inspect the water hose coming to the dishwasher for any blockages.
If these are fine then it's due to Water Inlet Valve. Use a multimeter and check for the continuity on inlet valve. If you don't get any value on the multimeter then you'll need to replace the water inlet valve assembly. Hope this helps... Please post back for any further assistance.


Feb 10, 2011 | Whirlpool Dishwashers

1 Answer

Have a Whirlpool GEQ9800LW0 and it won't start. When I set the timer and push the start button nothing happens. The timer still makes it's usual clicking sound but the dryer won't start. What needs...

Check power to the inlet valve, if absent let the program move forward and if the motor does not work either it is possible that thetimer though ticking is not contacting.
So go back to check for the wash cycle, when start is pushed, inlet valve on, water comes in, water fills , triggers level sensors,washing starts with motor on.
If there is no voltage on any parts ,the timer contactor is faulty

Sep 19, 2010 | Whirlpool GEW9200L Electric Dryer

1 Answer

No water entering dishwasher; motor running

The water-inlet valve lets water enter the machine. First Check to see if the valve is getting water. Make sure it’s not clogged. There is a screen on the inside of the valve, this sometimes gets clogged up with debris. Check to see if you get power to valve when unit is put into operation may take a couple minutes to start a fill. If you have power and it’s not clogged up replace the valve .If you have no power to the water inlet valve check float switch. This can be done by checking the continuity. There is a video of this at this will walk you checking the water inlet valve and the float switch. It may be a different model but the testing procedure will be the same. You can also enter your model # for diagrams and illustrations for most models. All parts come with installation instructions.

Jun 08, 2010 | Danby DDW1805W Designer Series...

1 Answer

Only motor goes on, no water

try these
  1. Check that the water supply is turned on. The valve may be located under the sink.
  2. Check the door latch
  3. Test the door switch
  4. Inspect the float assembly
  5. Inspect the fill tube for kinks
  6. Test the float switch
  7. Check the inlet valve filter screens
  8. Test the water inlet valve
  9. Test the drain valve lever arm
  10. Check the drain valve
  • please rate my suggestion....

Apr 11, 2009 | KitchenAid Dishwashers

1 Answer

No water coming in

Check the float.
There is a float inside the dishwasher but you can't see it. The small dome in the bottom has a float inside that activates a switch underneath by a plunger. Sometimes this float gets stuck in the up position. Take the bottom panel off and look directly under the dome for the switch and the plunger that activates the switch. Push this plunger up to see if it moves freely. If it moves then you need to check the switch then the water valve solenoid with an OHM meter. Next, use the meter to see if the timer is sending power (110) to the water valve.

If everything is good to this point then check the water supply. Turn the water supply off, disconnect the water line from the dishwasher water valve, run a small amount of water into a pan.

Hope this helps.

Jan 18, 2009 | Kenmore 24 in. 15932 Built-in Dishwasher

1 Answer

Water problem

Many dishwashers will drain at the beginning of any cycle.
If the water does not fill after the pump-out cycle, then the problem is either the fill valve or the float switch. You should be able to hear the float switch click as you raise or lower it. The fill valve usually hums whenever it has power.
If the fill valve has power but doesn't open, (use a voltmeter) replace the fill valve. If there is no power at the float switch, nor at the fill valve after pumping out, then the clock / timer is at fault.

Mar 10, 2008 | Dishwashers

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