My Bosch WAS32783SN washing machine that is 7 years old, and often I get Error F-23, which according to this list is
F23 is flood protection in base of machine activated. Pull machine forward onto a towel, pivot if 45 degrees forward onto the front feet (ie lift back feet of the floor about a foot) If water runs out from under the machine this will prove this. You will find that the machine will probably work ok now, but you will have to trace the leak of it will reoccur. likely causes are tear in door seal, leaky inlet valve, blocked dispenser inlet or as simple as something was caught in door on previous cycle allowing water to run down the front of the unit and into the base.
which could be the case, as tilting it does fix the problem and a bit of water is coming out.
So the big question is, how can I figure out where the leak is coming from?