Bosch SHU 5300 dishwasher not draining

I came home from a trip and the bottom of the dishwasher was full of water. When I opened the door it started flooding the kitchen. I can't remember so maybe I did a rinse and hold before I left for my trip.

I started the dishwasher so that it would drain the water. It would start for a half second and then stop. It was pulsing and small amounts of water would shoot into the sink drain but it wouldn't continuously empty the water. Further, while it was cycling in little spurts to empty water I could hear the intake water activating so basically the water level never changed.

So, it was full, wasn't emptying, except for small intermitent amounts, and was filling at the same time.

The filters and drain appear to be clear of stuff. Is this a motor issue, a water level control issue, a defect in the electronics? where do I start troubleshooting?

thanks