Kenmore 110-series Washing Machine Not Working

Yesterday, my 110-series Kenmore washng machine stopped working mid-cycle. That has happened once before, a couple of years ago, but the fix isn't working.

Luckily, it stopped in the middle of the final rinse so I took all the clothes out, sucked out as much water as I could with a wet/dry vac and left it unplugged for several hours. When I plugged it back in, the sensing light was flashing continuously. I held down the reset button for 30 seconds, the light went out, but then the machine started humming. It didn't reset. Nothing that I did would elicit a response. I couldn't get it to go into diagnostic mode at all.

Ideas? If it's a main board issue, I'll probably just replace the washer and dryer with something new, but I'd prefer to not do so if it's an easy fix. The last time this happened, the 30-second reset button fixed it and it's run like a champ ever since until yesterday.

Thanks.