My Bosch Exxcel Auto Option dishwasher will not fill with water!!?

The dishwasher seems to be working by the sound of it, but when I opened it after the cycle, it did not fill with water and is still full of dirty items...HELP!! I have never had a dishwasher before and this was a second-hand one which was in good working order. Can I see all the internal parts in a diagram something may be missing.

Many thanks