aquabot viva pro doesnt turn on (only 2 lights)

by Gunther
(Antwerpen, Belgium)

hi,
couple of weeks ago bought a viva pro aquabot. It really is helping to clean the pool professionally.
Today tried to switch it on, and only the right 2 little lights on the aqua control unit work for 1 sec. As long as you keep the green button pushed in, the pump keeps working...
can someone help to explain what i need to do to make it work again...

thanks
Gunther