Soap dispenser does not open during washing
Dishwashers have a soap dispenser located on the inside of the door. When the timer cycle calls for the soap to be emptied into the dishwasher, it either sends electricity to a bi-metal switch that opens it, or it mechanically opens the soap dish. On many dishwashers, a plastic actuator arm mechanically links the timer to the detergent cup. When the timer reaches the proper time in the cycle, the timer activates a lever that opens the detergent cup. If the linkage is broken or defective, the cup stays closed after you've closed it. Check the link and repair or replace it, as necessary.
The detergent cup itself can become clogged with old dried detergent that prevents it from opening. Sometimes just cleaning the cup takes care of the problem. If not, you probably need to replace the entire cup assembly.
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