Most likely you have an air lock in the dishwasher.
1. Refill the salt compartment.
2. Turn of the water supply at the mains.
3. Disconnect the diswashers water hose from the mains supply.
4. Lower the water hose and allow any water in it to drain from it.
5. Reconnect it and turn on your mains supply again.
Good luck.
Argus Longjob, October 2008