Diswasher doesnt finish cycle

My brother has a Frigidaire dishwasher that doesn’t finish its cycle. The complaint is that it continues to run. At first I thought it was the timer getting stuck so I replaced that.

However it is still happening. The way he explains it is that it gets stuck in the wash cycle. I didnt see a ‘clean water’ sensor in the parts list of this DW do dont know what else would keep the cycle from advancing…