Hello Carol,
The Bosch dishwasher has a moisture sensor, (flood sensor), in the bottom assembly that will shut off the units' ability to do anything but drain out. The drain pump will run as long as the moisture is sensed and nothing else will work on the unit until the moisture under there is dried up. Normally what I see in this case is a bad water inlet valve AP3783031. Occasionally, there will be a leak around a hose or seal but this is a situation where a technician has to "clamshell" the unit to gain enough access to locate the leak.
Since the water inlet valve is the most common failure, I would change it before calling anyone for the more extensive repair. Also, while the old water valve is out, before you install the new one, I use this opening with a towel or paper towels to dry up the water that is in the base already. Doing so will enable the unit to operate again. You can, if you desire, leave the water valve off for a day or so with a fan blowing into the base to evaporate the moisture. This takes a while if there is water puddled in there so if this is the method you want to use, wick the majority out with the corner of a towel then use the air flow method to dry out the remaining moisture.
Answered by AppliancePartsPros.com