GE Potscrubber 640 stays in wash mode

The GE Potscrubber 640 dishwasher will wash only and will not cycle. The dishwasher will not drain water nor rinse.

I have replaced the Timer and the Cycle Switch with no change in operation. Any suggestions as to what is wrong?

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The real problem was that the washer would not drain, which gave the appearance that the dishwasher was stuck in the wash cycle. The root cause was a failed drain solenoid, part number WD21X802. The drain solenoid coil failed open (coil measured infinite resistance with an ohm meter). The dishwasher operated properly after the solenoid was replaced.