Beko 4311W - draining constantly?

My dishwasher is constantly draining. I've checked the outlet pipe and it is clear (disconnected it and added water in inside of machine and it pumped it out). I've also tried tilting it back 45deg - it started normally - was not draining but after it let water in the drainage pump came on and it ran constantly again. Any help would be useful.

Fraser
April 2014