Bosch Clasixx Dishwasher not filling?

I have a Bosch Clasixx dishwasher, it is around 6 or 7 years old.
We have had no trouble until now.
When we press any programme the usual noise from within begins, but it will not fill with water.
We have emptied the machine completely and tried all the programmes with no success.
Can anyone advise
Is it the pump?