Check if there is 120V to the water inlet valve while the control calls for water. You have to remove wires from one of the water valve terminals before testing.
If there is 120V - replace the water inlet valve.
If there is no 120V then check the wires and replace the control board.
- The part number for the water inlet valve is
AP178686
- The part number for the control board is
AP3158621
Here are the break down diagrams for the Maytag dishwasher
Model MDB7100AWW
Gene.