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There is an anti flood valve on the bottom of the unit. IT could be sticking or have a bad connection. IT should look like a dome shaped housing on the bottom of the tub. If that is not the problem then you are looking at further troubleshooting to see if it is the contoller.
Here is an excerpt from "Bosch Dishwasher Troublesoooting".
Running a Test Cycle
Bosch dishwashers have a test cycle which can be run as a troubleshooting
measure. The method to run this test cycle is similar across the Bosch
dishwasher range so if your dishwasher features seems different from those
described below then try experimenting, as the process is fairly straight
forward and will be very similar. Bosch dishwasher model numbers are usually
found around the top or lip of the door. One of the most common differences
between dishwasher models is simply the names of the buttons. For example in
the first example below, POWER SCRUB PLUS and REGULAR WASH may be called WASH
and ECO depending on your dishwasher model and the country you are in. The
other key difference is whether your dishwasher has a display panel (which can
display error codes) or not (in which case a program light will illuminate to
tell you the fault.
To run the test cycle hold down the POWER SCRUB PLUS and REGULAR WASH
buttons. Whilst held down press the ON/OFF button. The lights above them should
flash. Now you can check the status of each dishwasher program by pressing its
button. Now you can run the full test cycle = Press the POWER SCRUB PLUS and
REGULAR WASH buttons again. The dishwasher will start up and when the cycle has
ended one, if you have no display panel on your dishwasher model the indicator
lights will illuminate if a malfunction was detected as follows -
CLEAN - A temperature sensor fault. If this is the case then the test cycle
will be very short as the dishwasher will terminate the test once it's been
RINSE/DRY - A water sensor/filling fault. If this is the problem then the
test cycle will not complete as the dishwasher cannot detect the right level of
water, the dishwasher will just keep filling and draining again.
WASH - A heating fault. Check your heating element.
If you do have a display panel on your Bosch dishwasher then after the cycle
is complete an error code will be shown if a fault has been detected. The error
codes are as follows -
0 - No errors have been detected.
1 - A water sensor/filling fault.
2 - A heating fault.
4 - A water filling fault. This can also appear as F on the display during a
8 - A temperature sensor fault.
When troubleshooting your Bosch dishwasher, running
the above test cycle is a good start in diagnosing the problem and should give
you an idea of where the problem lies with your Bosch dishwasher and what fixes
and repair are in order. Our general troubleshooting page will give you some
ideas on other things to check on your dishwasher. Good luck!
Remove the filter from the lower front section of the wash tub and clean it out. Then start a wash cycle with no dishes and no soap. Once the water fills and starts washing,open the door and pour 1 quart of white vinegar in the wash tub. Close the door to resume the wash cycle. Let the machine run a complete cycle to the end to help clean out the water ports.
Cold water is the only type of water that fills your tub. The machine looks like it stops because it is waiting for the water heater to heat the water in your machine to a highert temperature, enough to get your dishes clean.On that model you can't say very often that your dishes don't get clean.
the internal parts of the valve are sticking open randomley.the diaphram/piston in the valve most likley have lime deposits on it due to poor water quality.you would need the water valve assembly but before you buy this part i would look where the water line goes into the dishwasher and it will lead you to the valve.remove the valve from the unit and disassemble the valve.clean all the internal parts in the valve and reinstall.75% of the time this works ,if not change the valve.