Tecnik dishwasher flood warning?

My dishwasher was still full of water when the cycle had finished. I restarted it and it emptied. Now when I open the door it makes a noise like it is trying to drain but there isn't any water in there, it has been doing this for hours? I read on another forum that it is a flood warning but it didn't give any advice on what to do?
Tecnik integrated dishwasher about 5 years old