My dishwasher does not run or stops during a cycle — what should I check?

First, verify the door is closed tightly and latched, the correct cycle is selected, and that there is power to the dishwasher with no blown fuse or tripped circuit breaker. Also check whether the motor has stopped due to an overload, as it automatically resets itself within a few minutes; if it does not restart, call for service. Additionally, confirm that the water shut-off valve is turned on and that the overfill protection float can move freely up and down. (Page 17)

From the official Kenmore F21 Washer manual, page 17

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