I tried the following and got the dishwasher running again:
1. Turn off breaker to dishwasher and wait at least 10 to 15 minutes. Then switch back on.
2. Press and hold down the HEATED DRY button for ten or more seconds. (The manual says 4 seconds, and this DID NOT work for me after many trials.)
We recently had a power outage due to a severe thunderstorm. You might ask any repairman if that could be the most likely cause of the issue if it has never before been a problem. If he says yes, check your homeowner's insurance to see if it covers the repair. However, beware of possible insurance rate increases due to filing a claim.
J. D. F., May 2011