Siemens dish washer - no water getting inside?

We have a Siemens built in dishwasher. Only a month old. It has been working fine. This evening the water supply light came on. Water still seems to be going in and coming out into the drain but the inside is bone dry.
When we turn it on we can hear water moving but it does not get to the inside of the machine.
I have checked the water supply, Reset the machine and checked the filter, but nothing seems to solve the problem.

Can anyone help?

Regards

Anthony