Question about Bosch 18 in. SRS45E02 / SRS45E08 Exxcel Slim-Line Free-standing Dishwasher

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I think the little ball inside the mushroom float in the base on my Dishwasher is **** down so will not drain. The Mushroom cup moves freely and I can hear teh pump going but the water is going no where.
All pipes have been check.
Last time the guy called out it took him to minutes and 30 quid to take the float out.
ANyone know how I can remove teh Mushroom float myself. I have tried but its in there good and firm and I dont want to break it

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Removing the water level sensor it is not a difficult operation, it is held with one bolt at the base of the floater arm.

The problem is that you cannot be sure that the floater is not working unless you find out that the floater is filled with water or stuck.

There is an electronic test to verify if water level switch activated by the floating sensor is working. Instructions here: Bosch dishwasher helps.

You can find replacement water level switch , and schematics on websites below:

BSH - Bosch Customer Service

Appliance411: Repair Parts

how to mend it .com - ~~ Wiring diagram for BOSCH Dishwasher.

Posted on Feb 07, 2009

  • Ginko
    Ginko Feb 07, 2009

    Hi there, I will be grateful if you can explain what was inappropriate in my solution, please correct the rating given.

    Many thanks.



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Bosch SL1501B dishwasher doesn't drain water after the washing cycle. Also with new drain pump. What else could it be?

Check the following.
1. The drain hose has to be discharging at a high enough point to prevent water flowing back into the machine.
2. Make sure your drain hose is not twisted or kinked.
3 . Make sure your drain line is not blocked push a flexible hose down it to dislodge any fat/debris
4.If your drain line discharges into a shared drain with another appliance i.e. garbage disposal make sure it is not blocked.
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Since you mentioned the mushroom shaped float allowing the washer to empty this may be defective.
See the link attached.
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Check the float. The float is a mushroom shaped item on the bottom of the DW. Gently Check to see that it moves freely.


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The washer floods at the end of the cycle the pump is working this i know because when i manualy lift the mushroom float it pumps out could it be that there is a membrane in the mushroom float that is...

Hi there,

I'm not entirely sure what you mean by "floods at the end of the cycle". Is water leaking from the washer and where from?

The mushroom float isn't a water level sensor to determine when the washer should pump out. It's a second level safety feature to prevent flooding if the washer overfills. The flow meter regulates the water level in the washer.

Your pump is obviously working and there is no blockage in the drain hose, etc as the water pumps out when you lift the mushroom float. It sounds like the pump isn't receiving a signal from the controller to pump out at the end of the wash cycle. Lifting the float bypasses the controller and runs the drain pump.

Please try the following simple test:

1. Switch the programme selector to "Off"
2. Empty a bucket of water into the bottom of the washer
3. Turn the programme selector to any wash cycle
4. Press and hold the Reset button (start/stop) for at least 3 seconds. The washer should drain.

Please try this test and let me know if the washer pumps out. Please can you also be a little more specific about how and where the washer is flooding.


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Look inside the dishwasher for large plastic mushroom-shaped thing in the bottom. This is a float. Sometimes a knife or fork or something else gets in the bottom of the dishwasher and won't let the float go down. When the float is up like this, the dishwasher thinks that it is already full of water, so no water pumps in.
If this is the case, simply remove whatever is blocking the float from going down, and it will work again.

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There is a simple test you can do. Turn the power on and open the dishwasher door. In the bottom of the washing compartment near the centre you will see a dome/mushroom shaped plastic object (the float). Lift the float as high as it will go (about 1-2 inches) and, keeping it lifted, see if the pump starts.

If nothing happens, then it's likely that you need a new waste pump. If you can hear a faint humming, but the water doesn't pump out, then your pump impeller may be jammed or the impeller may have come off the drive shaft.

Try this test, post back with the results and I'll try to assist further . . .

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You didn't say what model you have, most dishwashers have a float switch inside to prevent over filling and subsequent flooding. If this switch is stuck, the dishwasher won't start.

Open the door and look inside the unit. The float should look a little like a mushroom cap. Make sure it travels up and down smoothly. It's usually on the right side closer to the front of the machine.

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I have a guide here that covers problems with the drainage functions and also the float switch. It is on the left side as viewed from the front, and it's behind a panel held on by 2 - T-25 screws. Be careful that you do not break the plastic holding the switches in when you take it apart. you will need to clean the float thoroughly.

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Your reply

To be honest with you, I've never personally seen the inside of a Viking dishwasher. But I've also never ever seen a dishwasher without a float switch.

In every dishwasher I've seen, there is a small donut or mushroom shaped thing under the lower rack that will float when the water level gets high enough. This switch prevents overfilling the dishwasher and flooding your kitchen.

If your machine doesn't have one, I'm sorry to have misled you.

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I had this problem and almost tossed this thing out the window. The water stopped pumping into the washer but the cycles kept on going... HERES HOW YOU FIX IT!! In the front bottom right you see the mushroom shaped float..... on the underside of the dishwasher you see that is pushing down on a switch. Its a simple little switch but the plastic pin connected to the float is easy to knock off the switch witch always leaves it in the up position !!! this is telling the washing machine that it is full of water. Find a way to keep the plastic pin on top of the metal switch and this will fix your problem. I used tape with a small piece of paper to keep from sticking to the pine or switch!!

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without a brand or model number its hard to be sure, but some types have a float cut out switch inside the washer. Its on the bottom inside and kind of resembles a plastic mushroom. The top should lift up and down easily. detergent will clog it up and keep it from moving. Just clean all the soap caked on it and move it up and down to see it it pushes a little switch underneath.

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