Kenwood dishwasher KDW12SL3A draining problem?

I have a Kenwood dishwasher KDW12SL3A. It's worked perfect for 2 yrs. Yesterday when it got to the drain cycle water started pouring through door. No fault code showed up. We turned it off, emptied all the water. Cleaned the filters & poured hot water down the waste hose which didnt appear blocked. Tried it again & when it got to the drain cycle same again!! help.

Alison
April 2013