Resetting controller on Ariston dishwasher

Resetting controller on Ariston AFA250?
I made the mistake of opening the door of my dishwasher a few times during the rinse cycle, now it refuses to do anything.
When I power it up the machine drains the water out of the bottom & then stops with the green led flashing. I've tried disconnecting the mains but I can't work out how to kick it back in to life.
We have had the problem once before & the engineer took 2 minutes to fix it so I suspect that the controller needs reset in some way.
Does anyone know how to reset it?
Many thanks
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Its flooded if locked out and emptuing all the time upon power on. Its in the book what the flashing light error means. Remove water from inside base, use a wet/dry vacuum cleaner if a lot, ensure float is moving freely and cure the problem thats causing the leak (opening the door to often ?). The engineer used a special tool to perform his operations (or you can remove the front).
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