suddenly stopped working

I have a Whirlpool Quiet Partner III dishwasher, model GU2548XTPS6 that has suddenly stopped working. I usually program it for a delay start, so that it runs overnight while we’re sleeping. This morning, the clean light was flashing, and the dishes were still wet – like it didn’t go through the heated dry cycle that I always use. I cannot start it on any cycle, and when I hit the cancel button it runs for 2 minutes (not sure what it’s doing, though). The clean light flashes 7 times, then stops for a few seconds, then flashes again for 7 times, etc.