Re: AEG 50750 flood protection
The only mention is how to cancel a cycle, this is done by holding the relevent programme selection key in for + 3 seconds but that is probably described in the user manual.
If that doesn’t work, the base is probaly flooded with water. Try tilting the dishwasher and see if any water runs out (towels handy ;))
Power off if going further or check the repairs@ link below for an engineer if you get stuck 🙂
Dave.