Looks like you didn't get any replies. I'm working on a similar problem right now (330 pm EST 21 Aug).
The inlet solenoid opens for the correct time (90sec), but dishwasher seems to not get full enough (nowhere near emergency shutoff float actuation). The spray is very weak, won't spin the lower arm or even deliver any water to upper arm. If I add a half gallon of water manually, I get lots of pressure and spray, but the machine seems to automatically evacuate the extra water within a few seconds.
I thought maybe there's a clog in the inlet line (discharge of the inlet solenoid valve).
Is the drain hose brought up well above the normal water level in the dishwasher? - if not then the machine will be unable to maintain the correct water level, as the water will simply flow out the drain.
Even if the drain is at floor level, you need to bring a loop of drain hose up to approx worktop height.
There's a float that determines water level on the floor of my dishwasher and a little plastic ring got caught under it preventing water from coming in. I paid a repairman $40 to come take it out for me
Check the water supply valve first to see if there is power going to it . If there isn't it is probably your timer. If there is power going to it, change the valve.Both are fairly easy repairs.
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