Hi good day to you from David. It sounds likr your solenoid has the voltage but still not opening. These solenoids have a plunger inside and this can swell overtime and then the plunger sticks inside the chamber. If you have a multimeter it would be worth testing to see if the voltage is correct and then change if neccesary. I will come back if I can source a part for you regards David.
What location are you please?
I thought the same as you, however, I can feel the plunger moving inside the solenoid valve when dishwasher sends a voltage signal to the coil. I was told there was another device downstream from this valve that could also cause the problem.
There is the water chamber bend but I have not heard of this getting blocked and is accessible by removing the side panel. You can of course remove the filling hose on the back of the valve and then fix a longer hose so as you can direct the water and see if you are getting water passing through the valve to back up your theory downstream. Hope tis helps regards David.