I have a bosch shu4303uc dishwasher and it overflowed and now has water in the tray area underneath. I have gotten most of the water out but unit will not wash will only sound as if it is constantly draining even with the door open. Is this a float problem and where is the float located? Thank you!

If you can see water flowing down the overflow channel to the pan at the bottom of your Bosch dishwasher while it is running, this indicates that there may be a problem with the dishwasher's float switch or water inlet valve.
The float switch is a small device located at the bottom of the dishwasher's tub that is designed to detect the water level inside the dishwasher. If the water level rises too high, the float switch will shut off the water inlet valve to prevent the dishwasher from overflowing. If the float switch is not functioning properly, it may allow water to continue to flow into the dishwasher, resulting in water flowing down the overflow channel to the pan at the bottom.
Another possible cause of this issue could be a faulty water inlet valve. The water inlet valve is responsible for regulating the flow of water into the dishwasher. If the valve is stuck open or is not functioning properly, it may allow water to continue to flow into the dishwasher, resulting in water flowing down the overflow channel to the pan at the bottom.
To resolve this issue, you may need to have a professional technician inspect and repair your Bosch dishwasher. They can test the float switch and water inlet valve to determine the cause of the problem and replace any faulty components as needed.

Check to make sure there is no residual water underneath the unit, they have a flood sensor and if it is picking up water in the motor area it won;t run.

i'm gonna guess that you are manually turning the water on and off under the sink. if this is the case, you are taking the place of the water inlet valve which is probably bad or stuck open. since you have already gotten your feet wet with repairs on this machine, you can most likely handle this one too. good luck

Food or debris could be blocking the drain line before the water pump or after. So unplug the unit or cut the power to it then begin working on the washer. You will need a pliers or medium size channel locks to take the hose clamps off. Make sure the line is clear from the unit to the water pump. Then check the pump over carefully. Then the line from to the discharge area. This should solve the problem.

Disconnect the power to the unit. Remove the lower access panels and check the tray under the dishwasher. You will probably find it is full of water. Use a towel or a sponge to remove the water. There is a float that will stop the operation of the unit and run the pump if water is in this tray. Test the unit. If there are no leaks, check the drain hose under the sink. THE DRAIN HOSE MUST RUN UP TO ABOVE THE TOP OF THE MACHINE THEN TO THE DRAIN. If the hose is not set up like this, water from the sink drain will flow into the dishwasher and overflow into the tray under it.

If there is no water in the pan under the dishwasher there may be a problem with the pressure switch at the side of the pump housing but the only way to know for sure is to do some electrical testing with a volt/ohm meter and the wiring diagram located within the appliance.

Go here for Bosch Dishwasher Parts: http://www.repairclinic.com/Bosch-Dishwasher-Parts



www.RepairClinic.com

Reset is probably a key combination, not sure which one though. Would have to refer to the manual. Unplugging it for a while should also reset it. With all the water cycling and overflowing some water may have gotten into an area of the dishwasher where it shouldn't have.

Here's a post where the user had a problem that sounds a lot like yours. Read the last paragraph to see how they resolved it.

Here's another link for diagrams, manuals and how to guides for your unit.

Hope this helps. Let me know if I can be of further assistance.

remove the kick plate below the door. youll see a white tray behind the kick plate. theres water in the tray thats activating a overflow switch. with a towel or 2 remove as much water from tray as possible. this will solve problem

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.

when facing the dw pull it out from under counter and on the left side there is a panel held on with 2 screws. take that off and under there are the float switches for the overflow. those switches is what causes the pump to run all the time but do nothing else. 

Similar problem for us turned out to be water accumulating in the tray which set off the float switch.  I vacuumed the water out and function returned to normal.  However, we are now facing a repairman's assertion the clay in our well clogged the water inlet systems necessitating $285 in repair parts and labor.