Kenmore Ultra Wash model #665.17032402?

I loaded the dishwasher and started it. It started, but before it got to the wash cycle, it started making a buzzing noise. I thought it might be in the sensing mode, so I let it go a little bit. The noise stopped, I thought it was cycling, then the noise came back. Then I started smelling a burning odor - like an electrical burning. I stopped the unit, opened the door & did notice the bottom was full of water. I hit cancel & the unit drained. Any ideas what happened? Is there something I can check for like debri, clog, etc? Thanks.