No replies from any supplier with a valve suggestion, so bought a generic one from ukwhitegoods. Attached wiring, and potted it in epoxy for safety. Water enters now, but it is apparent that the circulating pump is not moving water around, although there appears to be a humming noise as though it is trying to start.
Being semi integrated, there is no access to pump without getting to the bottom. I'm old and disabled, so such manipulation is difficult for me.
I'm thinking that either the pump is blocked, or faulty, or I see some mention online of starter capacitor issues.
Since it would be unusual to have 2 faults at the same time, I wonder if there could be pcb issue.
It seems the dishwasher is a badged chinese Haier make, with poor opinions of it. Maybe it's done well to work fine for 4 years, and I'm now flogging the proverbial trying to keep it going?