11 flashes is a water pressure sensor fault.
What you can try is take out the bottom basket and the filters and the mesh filters at the bottom.
From there look inside the sump on the right hand side. There you will see a black grid. You need to pore boiling water into the sump. Then carefully use an old tooth brush and give the switch a good clean. But not to hard as it can damage the membrain in there.
Once this is clear retry the machine and see how it goes from there.
If still the same then the changes are the water indecator (black grid) will need to be replaced.
If you need anymore info just get back to me.
Just wondering how you got on with the dishwasher as the question is still open.
Do you still need help on this? If not then if you could rate the answer i gave that will close the question.