How to Tell If You Have a Clogged Dishwasher

Updated May 7, 2025

Your dishwasher is an extremely useful kitchen appliance, and can potentially save you many hours you would otherwise spend washing dishes by hand. However, container labels can cause clogs if wet chunks of paper become trapped in the filter. When your dishwasher becomes clogged, it can become a major inconvenience, and even end up leaking and causing a watery mess in your kitchen. The air gap is a crucial component that prevents backflow from the sink to the dishwasher. Built-in dishwashers often drain through the garbage disposal, so it's important to check for clogs there as well. Luckily, our skilled Redding plumbers know all about clogs and the importance of a clean filter in preventing them. 

Keep reading to learn how to tell if you have a clogged dishwasher, and remember to call Wallner Plumbing, Heating & Air for all your essential plumbing services.

The Top 5 Signs You Have a Clogged Dishwasher Drain

1. Slow Drainage: If you notice that your dishwasher is draining slowly, you will want to check your kitchen sink, too. If both are experiencing slow drainage, a clog may be forming in your plumbing system, between your dishwasher and your sink. If this type of blockage builds up for long enough it can cause flooding, so if you suspect this is happening in your kitchen, call an experienced plumber for drain cleaning right away.
2. Strange Gurgling Sounds: A gurgling sound coming from your dishwasher is a major indicator that something is wrong with your plumbing. This is because these sounds are not actually coming from the dishwasher itself, but from the drains attached to the dishwasher. Gurgling is another sign of a drain clog, so you should call a plumber right away if you hear it.
3. Water Backups: If your dishwasher is experiencing a water backup, it may be because you are running another component of your plumbing system at the same time. If water is backing up in your dishwasher, turn it off and turn on the garbage disposal. This should clear out food and debris caught in your kitchen drains that may be causing the clog. If your dishwasher continues to back up after this, you will want to call an experienced plumber right away.
4. Standing Water: Puddles of standing water at the bottom of your dishwasher may be a sign of a drain clog somewhere in your system. First, check the strainer in the back of your dishwasher, to see if there are any food particles and debris that are clogging your dishwasher. After emptying the strainer, there should be less water residue after running the machine. If that doesn’t work, you should call a plumber to see if you have a drain clog on your hands.
5. Dirty Dishes: If your dishwasher can’t do the primary thing it’s supposed to do, i.e. wash your dirty dishes, it may be because there isn’t enough water entering the unit. If this continues to happen, call a plumber, as there may be a drain clog preventing the ideal amount of water from reaching your dishes. You also don’t want water that’s passed through a clog cleaning your dishes, as this is unsanitary.

How to Unclog Dishwasher Drain 

Cleaning the dishwasher filter is crucial as it can become clogged with food particles and other visible debris. Regularly removing the filter and inspecting for blockages ensures optimal performance. Other debris, such as food particles, can also cause clogs and should be checked regularly.

For more complex issues, professional dishwasher repair may be necessary. Using paper towels to soak up remaining water can help prevent leaks during troubleshooting. The air gap, a small slotted cylinder, prevents drain water from backing up into the dishwasher and should be checked regularly.

Wet chunks of food and paper can cause clogs in the dishwasher. Checking the drain valve for clogs is also essential. Always follow the maintenance instructions in the owner's manual for effective appliance care and troubleshooting.

Using Baking Soda to Clear Clogs

Baking soda is a natural and effective way to clear clogs in the dishwasher drain. To use baking soda, mix equal parts baking soda and vinegar and pour it down the drain. Let it sit for a few hours, and then run a hot water cycle to clear the clog. This method can help break down any tough food particles or debris causing the clog. Additionally, running a rinse cycle with baking soda can help clean the dishwasher and remove any remaining debris. Regular use of baking soda can help prevent clogs and ensure the dishwasher is draining properly.

Checking the Dishwasher Filter to Prevent Clogs

The dishwasher filter is a critical component of the dishwasher, and regular cleaning can help prevent clogs. To check the filter, locate it at the bottom of the dishwasher and remove any food particles or debris. Use a soft brush to clean the filter, and then replace it. It is recommended to check the filter after each use to ensure it is clean and free of blockages. A clogged filter can cause dirty dishes and silverware, so regular maintenance is essential.

Need Help? Call the Trusted Plumbers Redding CA Relies On

If you're tired of dealing with a clogged dishwasher, then it's time to call in the professionals at Wallner Plumbing. Our team of experts has been serving the Redding area and its surrounding communities for years, providing top-notch plumbing services that keep your home running smoothly. Whether you're dealing with a minor clog or a more serious blockage, we have the tools and expertise needed to get your dishwasher back in working order. So don't wait any longer, contact Wallner Plumbing today and let us help you get your kitchen back to its clean and functional best!

For more information about clogs and how to get rid of them, dial (530) 223-5622 now, or contact us online.