What should I do if the detergent cup won't latch after adding detergent?
The Cycle Indicator Dial must be in the OFF position for the cup lid to close and latch properly. If you unlatch the door and open it to dry your dishes, the Cycle Indicator Dial does not advance to OFF by itself. Ensure the dial is at OFF before adding detergent.
From the official GE GSD820 Dishwasher manual, page 12
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