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E4 fault code Bomann GSP 628 dishwasher?

Hi Folks,
my Bomann GSP 628 dishwasher is showing fault code E4 which implies that there is too much water in the machine, that is to say it isn't emptying properly.
I have soaked up the excess water inside of the machine, and checked the pipes for any blockages.
The question is how do I reset the machine? Does anyone have any ideas?
Al, November 2013