how can I fix my bosch dishwasher?

I have a bosch exxcel dishwaher. It does not take in water during any of the cycles. The inlet water pipe is free and working, but no water is reaching the machine to be able to wash. I have descaled the inside of the machine with finish dishwasher cleaner, but that only allows a very small amount of water in, not enough to clean and rinse....please help