The 3 most common part(s) or condition(s) which cause the symptom Dishwasher dispenser doesn't work are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 1547254
If the dishwasher dispenser doesn't work the problem is often related to the release mechanism. If the problem is with the dispenser itself, it may be easier to replace the entire dispenser.
RepairClinic Item # 1060489
If the dispenser is broken and doesn't open or close properly the entire dispenser assembly may have to be replaced.
RepairClinic Item # 1875709
The main control board provides power to nearly every component of the dishwasher including the detergent dispenser. If the dispenser will not actuate the main control board might be defective. You should first check for more common parts. Many times control boards are replaced unnecessarily because the problem was not diagnosed properly.