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Bosch SMS4012GB dishwasher. Refused to fill. Found tray full of water in base of unit. Mopped up water about 2 litres. Machine works but lower reservoir on the side of the machine with float switch overfills and overflow leaks about an eggcup full each cycle. What is causing the overflow please?

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An electric switch activated by air pressure. This device detects air pressure exerted on it through a flexible tube connecting it to part of a water tub.
When activated, this switch then opens an electrical circuit stopping further filling of water into the machine.. May also be called a PRESSURE SWITCH. if not activated definately it will cause overflow.

Check the wire harness to the pressure switch. or tap your float switch with finger tips may be it get stacked. if nothin happen replace the pressure switch.
Rate my solution if useful.

Prince P

Posted on Jul 24, 2008

Problem was not electrical but a blockage and general scale build up not allowing the metered water to fill the cabinet quickly enough. Thanks for the input Prince P it set me off on the right track.

Posted on Jul 30, 2008

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6ya6ya
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Posted on Jan 02, 2017

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If you take the lid off followed by the left side panel ( held on with 2 torx 20 screws ) the lid has two clips at the back and pushes back from the front.
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Introduction: This may work for your problem, but only if you're finding that you cannot get further water to flow into your machine. If your machine fills OK, then this ISN'T a solution to your problem. If your machine doesn't fill but your drain motor continues to hum for no apparent purpose, this may work.

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STOP: disconnect power supply at this point for safety.

To see the white plastic tray and thereby fix the problem, you'll need to take off the BLACK TOE-KICK (attached on my unit by two star-head screws at its bottom) and, possibly , the OUTER PANEL OF THE DISHWASHER DOOR (in my case, a custom wood panel (attached by a few screws through the inner side of the door, two screws that are accessed by popping off little--smaller than a dime size--covers on the sides of the doors, and then the door panel lifts up and out). (I took the outer panel off, but I can't remember if I would have had to reach into the white tray without doing so.)

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