HI Accumulated detergent from prior washings can cause problems with the soap dispenser. Buildup can get into the soap dispenser and interfere with the spring that triggers the flip-out tray, or it can slow down the pivot action of the tray. If the dispenser is not opening, first make sure you aren't loading the machine so dishes or pots and pans are touching the dispenser, and that dish racks aren't blocking the dispenser. Also check to make sure the dispenser tray isn't cracked. If leftover detergent in the tray is almost liquid, rather than just damp, the tray may be damaged.
If you can't solve the problem easily, replace the entire dispenser unit. This is usually easier than trying to disassemble it and replace separate parts. Use a new dispenser made for the dishwasher. The screws holding the dispenser in place may be on the front of the unit, or you may have to remove the front door panel to get to the screws and make the replacement. Remove the old dispenser and secure the new one, connecting it in the same way the old unit was attached.
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