Bosch dishwasher Won't fill with water

Started the dishwasher this morning and it started to fill. Then opened it - added another dish closed it - and now it won’t fill. It will drain - if I press cancel and drain - but not fill. I have tried each cycle - and nothing.

It hums like it wants to fill - but nothing happens. I have tried turning it off. Resetting the breaker and turning it on again (hoping it would magically reboot like a computer!)

I tried the self-test - pressing powerscrub and regular wash together and then the on button. The display came up as C1. Then P0. The Quick Wash light is steady on and the r/h light blinks. If I press the Quick wash button it displays p1 and if I press the r/h button it displays 0.

It was working fine last night! It is very picky about the manual filter - so the first thing I did was clean that. It was a little gunky.

What should I try next?

Thanks in advance!

Julie