SOURCE: Bosch dishwasher
is all the water draining from the tub? if not the pressure switch will not reset and it will continue to try and clear it self...check drainage system.
2. pressure switch is jammed on..build up in the sensing chamber..common..or switch faulty...rarely
3. if water is in the bottom panel most have a flood switch which automatically operates the pump in case its over filling
SOURCE: no fill - drain pump running - I assume stuck float switch
remove the bottom plate of the dishwasher and the bottom pan is revealed. reason the drain pump is running will be that this pan has water in it ie you have a leak. mop out the water and dishwasher will work - switch off mains when you do this
SOURCE: no water being allowed into dishwasher
you may have a bad water soleniod. there is also a mesh on the solenoid. go here to identify
if you have your model number and make you can go here to identify it www.techray1.com then click on the guru guy on the left. this will open another window. on the left you can select your model and unit and part. If this helps please rank me
SOURCE: bosch Dishwasher. Mushroom float
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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