My Kenmore dishwasher won't stop washing. Last night it washed for two hours, but never emptied and went to the rinse cycle. We can hit cancel/drain and it will do that, then we hit "quick rinse" and it will run though that cycle fine. I saw elsewhere to check the hi-limit thermostat, but assuming that's fine, is there a way to check the control board without replacing it?

Edit: Checked the hi-limit thermostat, and there was no resistance. The meter read zero.