Problem: Your Bosch dishwasher will sometimes finish the cycle, but other times it stops without draining. You might or might not get an E19 error, and it might not be consistent.
This is an intensely irritating error because the internet does not agree on what E19 means. Some say it's not enough water, some say too much; some say it's the drain valve (which does not exist on my model), others the drain pump. It's maddening.
Possible solution: Something has bypassed all the filters and gotten into the drain pump, preventing it from spinning / working reliably.
With all the filters in the thing, you'd think that would be utterly impossible. Yet, when I checked mine, I found this little bugger rattling around the pump rotor: