What should I do if my dishwasher won't start?

Check that the door is completely latched, the unit is turned on, and the water supply valve is open. Also verify that a cycle has been selected before closing the door, no delay start is engaged, and the circuit breaker has not tripped. If a previous cycle was not completed, refer to the 'cancelling or changing cycle' section to reset the unit. (Page 16)

From the official Bosch Ascenta Dishwasher manual, page 16

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