What should I do if the detergent cup lid 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. If you used powder detergent, open the cup and remove any caked-on detergent.
From the official GE GSD500 Dishwasher manual, page 11
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