E15 error code means water has leaked into the base of the dishwasher.
What you need to do is pull dishwasher out and tip it backwards and this will allow the water to drain out from the bottom so you will need a towel for that part.
Once the water has drained out the anti flood switch will reset itself and clear the E15 error code.
So then retry the dishwasher and fingers crossed this has sorted it. But if it does it again then theres a leak in there which you need to find and fix to cure this.
Let me know how it goes from there.
Brilliant, a star, the worst part was getting the thing out, floor covering being caught up & being integrated!!!! Would a partially blocked filter be the cause? Hope it is!!
It could be as all it takes is an overflow inside the dishwasher for it to over fill and leak into the base. So usually if it completes a fully cycle without doing it again then its just an overfill that cause it.