I have a 2 yr. old KitchenAid KUDPQ2 built-in and often the soap dispenser lid won't open so no detergent gets into the cycle. I'm careful not to block it with dishes when it closes but it's very frustrating and unpredictable.
I took the door apart and found the degertent door solinoid looking like it over heated and melted to the cover flap and the insulation. See picture. I can't post pic as the max is 150kb.
I applied power and it only got hot and wouldn't operate.
Next I go to Kitchenaid for a replacement - FREE it should be.
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Most likely it's a corroded door catch or a bad solenoid. Hopefully it's not the main control board. You'll need a repair manual or technician. A work around would be to use detergent tablets in the compartment
Dishwashers use Bi-Metal strip to allow the dispenser to open/close. This strip when heat up causes the soap door spring to open up the dispenser. If this strip is not heated doesn't allow the door to open. The strip may not be getting 120V or maybe disconnected. Newer (plastic liner) Maytag dishwashers use a wax motor to open the soap dispenser. The plunger inside the wax motor slowly moves and pushes the plunger and door open. And, if this wax motor doesn't receive 120 volts, then it'll not work. Please check the voltage to the wax motor/Bi-metal strip; also inspect the connections to these. Hope this helps...
The most common problem with the detergent doors on KitchenAid
dishwashers is that they either don't open during the cycle or open
only halfway. Before looking into more complicated repairs, make sure
that the door is able to open. Check the seal around the door and the
door latch for soap- and food-related gunk, and scrub it off if
present. Sometimes this can keep the detergent door from operating
properly. Consider switching detergents, as some liquids and
pouch-style dish detergents can gum up the detergent dispensers. Also,
make sure that there is nothing blocking the detergent door when the dishwasher
is loaded. Because of the location of the detergent door, a large item
such as a cookie sheet or a pan can prevent the door from opening. Run
the dishwasher through a cycle without anything placed in front of the
detergent dispenser and see if that solves the problem.
rely on an internal timer to complete the wash cycle properly. When
this timer malfunctions, certain steps in the wash process (such as the
release of soap from the detergent dispenser) can be interrupted. If
the dishwasher detergent door is either not opening or appears to be
opening late in the cycle, this is likely the mechanical culprit. A
broken timer isn't something that's simple to replace without knowledge
of dishwasher repair, so it's best to consult a professional if you
suspect that this is the problem.
Malfunctioning Door Components
For the detergent door to function properly, all of its mechanical
components must be in working order. Older dishwashers' detergent doors
rely on a spring-loaded hinge to pop all the way open when the timer
gives the signal. If the door doesn't swing all the way open instantly
when it's manually released, the spring may need to be replaced for the
dispenser to operate properly. If the particular model is newer and
does not rely on a spring to open the door, chances are it either uses
a wax motor or a bi-metal switch to release the detergent door at the
appropriate time. If either of these components is dying, that can mean
that the detergent dispenser will not operate properly.
Try reversing the bottom dish rack, it's likely blocking the dispenser door because it's put in the dishwasher incorrectly. Also check if there is anything in the back of the rack preventing it from going all the way in.