Diplomat ADP8322 wont drain?

My Diplomat ADP8322 won't drain, and appears to be leaking from somewhere, as the floor under the washer is sodden. It is an intergrated dishwasher and is not easily accessible. I turned the water supply off and the error code was F6 (water supply) however, when I ran the dishwasher before turning the water off, there was no error code, just a wet floor. Any advice at all would be greatly appreciated as the water is leaking through to the flat below!

Many thanks