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No start problem related to float in Bosch DW

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Hello all, I have a Bosch SHE45M with a no start problem related to the float on the left side

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  #1 (permalink)  
Old 05-15-2012, 05:47 PM
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Default No start problem related to float in Bosch DW
Model Number: SHE45M05UC   Brand: Bosch   Age: 1 - 5 years   

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Hello all,
I have a Bosch SHE45M with a no start problem related to the float on the left side of machine. The machine was working but had a small leak underside which ended up being the inlet connector. While I had it out I noticed there was a lot of gunk in the float assembly (the plastic assembly with a red cup, its opening down, with a red curved arm which actuates a microswitch) so i took it apart to clean it. I thought I got it back together properly, but the machine now won't start.
The power and water supply is on, and there is time displayed in the window, but the machine never runs (there is no water now in the float assembly, but there is some in the sump).

In going back to what I played with, I found that if I actuated the microswitch, the machine starts to run. This doesn't seem to make sense, since the microswitch is also connected to a rod pushed up by a float in the catch basin in the base of the machine. Logic would suggest that water in the bottom of the base would be a leak and should shut the machine off-not on.
So the only thing I can think of is - either I have some connector upside down, or - there has to be water in the trough where the red cup is to push the switch up (and I don't understand the purpose of the catch basin float in the bottom machine frame).
Can anyone explain how this works? I have a few photos, attached.

While we're at it, the door catch is extremely hard to open and close - is there an adjustment for this?

Thanx, Jasper


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Attached Images
File Type: jpg float_switch.jpg (57.5 KB, 23 views)
File Type: jpg float-all.jpg (70.0 KB, 22 views)
File Type: jpg float-rod.jpg (77.3 KB, 22 views)
File Type: jpg float-side.jpg (65.3 KB, 22 views)
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  #2 (permalink)  
Old 05-16-2012, 03:26 PM
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The cost of this part is just 11 bucks, so in such situation I would just replace this part.

- The pressure chamber Part number: 440670

Part number: 440670



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  #3 (permalink)  
Old 05-16-2012, 04:58 PM
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Cheap enough, but does it have to be filled with water first to make the DW start running? Wouldn't want to start replacing parts to fix something (unfortunately, much too common these days). And it might not solve the problem? I'm trying to understand how it works.
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Old 05-16-2012, 05:10 PM
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Based on the part name I'm assuming it works by a pressure. Also I don't think it had water when it left a plant.

This is a safety device to prevent overfill. It turns on the drain pump and turns off the water inlet valve as soon as it feels water in the base or the water over the level inside the machine.

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