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Dishwasher Detergent Cup Not Opening

Hi, Wayne here from ifixappliance.ca. we’re going to talk about what to do when your dishwasher dispenser won’t dispense detergent. Many dishwashers use a detergent dispenser with a cover that flips up during the cycle, like this one. When the dishwasher door is shut, the cover presses against the top dishrack so the lid doesn’t open fully, allowing spray from the lower spray arm to flush detergent out of the cup.

When you open the dishwasher door, the cup cover flips open—you can hear it pop. If there’s still detergent in the cup when you open the door, a dish might be blocking the detergent dispenser during the wash cycle, preventing the soap from dispensing. Avoid blocking the dispenser when you load the dishwasher.

Another reason soap might still be in the dispenser is the spray arm couldn’t get enough water into the dispenser to push all the soap into the tub—usually because something is blocking the spray path between the lower spray arm and the dispenser. When loading the dishwasher, leave the path clear so plenty of spray reaches the dispenser cup. Stale powder detergent can also get stuck inside the dispenser cup, because the caked powder won’t dissolve as easily in the water.

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Replace your powder dishwasher detergent if the powder clumps together easily. Don’t store powder detergent in the damp cabinet under the sink, where it absorbs moisture. Instead, store powder detergent in a cool, dry area such as an upper cabinet.

If the cover is still closed when you open the door after the cycle, check the cup, cover and latch for soap residue that could prevent it from releasing the cover.

Residue can clog the cover latch and coat the inside edges of the cover or the outer rim of the dispenser cup, causing the cover to stick shut. Clean the cup, cover and latch and see if the cup cover opens properly. In the future, try not to overfill the dispenser cup.

If the latch works and you aren’t overfilling the cup, then the dispenser actuator may be broken.

A wiring failure or a defective electronic control board could also prevent the cover from opening. To find the cause, let’s check the wiring and measure the resistance of the dispenser actuator. Unplug your dishwasher or shut off the house circuit breaker for the dishwasher to disconnect electrical power.

Open the dishwasher door and remove the Torx screws from the outer edges of the inner door panel. Support the outer door panel with one hand as you remove the final screws so the outer door panel doesn’t fall. Separate the outer door panel and control panel slightly from the inner door panel, and rest the outer panel on the floor while you disconnect the user interface control wire harness.

Pull off the outer door panel and control panel. Check the wire harness connection on the dispenser and reconnect the wire harness if it’s loose or repair it if you find damage. If the wire harness looks okay, check the resistance through the dispenser actuator using a multimeter.

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Checking resistance of the actuator tells us whether current can flow through it. Pull off the female wire harness plug to expose the actuator prongs. With your multimeter set to measure resistance in the 20,000-ohm range, touch one meter probe to each dispenser prong.

You should measure between 1,400 and 2,800 ohms of resistance through the actuator. If you measure infinite resistance—on this meter that’s a 1 in the far left corner—replace the dispenser assembly because the actuator isn’t allowing current to flow. Here’s a article that explains you how.

If you measure the proper resistance through the dispenser actuator, then a wiring failure between the electronic control board and the dispenser or a defective electronic control board could be preventing the dispenser cover from opening. An internal mechanical failure in the dispenser could also be the cause.

Have a service technician examine and repair the dishwasher in this case; the technician can perform live voltage checks to see if the electronic control board is sending voltage to the dispenser actuator. Those checks should only be performed by someone with proper training. I hope this article helped you out.

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You can find links to the parts we talked about in the article description. Check out our other repair articles here on the ifixappliance.ca website website. Subscribe and we’ll let you know when we post new ones.