My dishwasher does not fill

Hello, Just last night my Bosch dishwasher decided to let me down. It has been the best machine for the last four years; washes perfectly and quietly. Lat night I went out and left it doing the dishes for me as I always do. When I got home the electronic timer was sitting on 1 minute, there was no water in the machine, the soap block was undissolved in the bottom of the machine, and the motor was still humming. I turned it off at the wall, waited a while, then turned it back on hoping to reset the timer. It started at 38 instead of 88 and no water pumped in. I presumed from this that it is the solanoid (or fill valve) which is actually inline, right on the faucet, instead of in the machine like all the older machines I have had. Unfortunately it is a very expensive assembly and I do not want to order one in just to find it does not fix the problem. I wonder if anyone else has had the same problem, and if so, what they did to fix it. Or if anyone has any suggestions as to what else might be the problem.