What is the most common cause for a dishwasher not to drain?

• <div><p>If your dishwasher isn’t draining, some common causes include a clogged drain filter, drain hose, or air gap. Also, if you have a garbage disposal, a clog in the disposal can back up your dishwasher since they share plumbing, as can a clog in your kitchen sink’s plumbing. A handy DIYer may be able to figure out <a href="https://www.angi.com/articles/how-to-unclog-dishwasher.htm">how to unclog a dishwasher,</a> but you may need to call in a plumber if you can’t locate and clear the clog yourself.</p></div>

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Verified Reviews for Dishwasher Installation pros in Glendale, CO

*The Angi rating for Dishwasher Installation companies in Glendale, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

*The HomeAdvisor rating for Dishwasher Installation companies in Glendale, CO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Dishwasher Installation needs.

Last update on February 05, 2026

Reviewed in February 2026
Good guidance to self diagnose and fix a dishwasher drain pump clog. Heartily recommend!
Neli Virtual Appliance Repair
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Reviewed in January 2025
We had a problem with our dishwasher and Dimitri was able to identify the problem and fix it on his first visit. He was thorough, respectful, and highly comnpetent. I hihgly recommend him. David O.
Appliance RS
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Reviewed in February 2024
Installed new kitchen faucet thanks
Rooter Guy, LLC
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Reviewed in August 2023
Great job installing new water. Prompt service, excellent customer service.
Applewood Plumbing Heating & Electric
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Reviewed in June 2023
Nick helped me address an issue with a washer installation in a closet where the door to the closet couldnâ t be closed after the install. He proposed alternate solutions for it. He is very detailed and has good workmanship. He also helped me fix some of my own poor picture hanging. Iâ m...
Nick Buddo Contractors
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Reviewed in October 2022
The installers did a great job. Installation was quick, they look perfect.
Royal Gutters, Inc.
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Reviewed in March 2022
Langston was on time and did a great job at installing our new kitchen faucet and food disposer. The price was fair, and he also searched for parts for our old dishwasher, and recommended someone to buy a new one from.
Morrison Maintenance, LLC
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Reviewed in February 2022
King Rooter was fantastic. Our plumber, Charles, came quickly and worked diligently to solve the problem. He explained everything that was going on. And then, on his way out, he even helped us fix a problem with our dishwasher. The whole time he was courteous and professional.
King Rooter & Plumbing
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Reviewed in October 2021
Ed was a terrific service person. He was prompt. He explained what he was going to do, how much it would cost. He did the repair quickly, tested thoroughly. It was been working great since. In addition, he asked (and who does this?) "Any other appliances I could help with?" And then he fixed my...
Action Appliance, Inc.
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Reviewed in June 2021
Norman came to my rescue. I had a big problem with removing an old dishwasher and replacing it with a new one. It was a very difficult job that took hours to do. He got the parts needed which included a garbage disposal, new faucet, hose etc and had to put an electrical outlet under the kitchen...
America's Best Home Improvement, LLC
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Dishwasher Installation questions, answered by experts

If your dishwasher isn’t draining, some common causes include a clogged drain filter, drain hose, or air gap. Also, if you have a garbage disposal, a clog in the disposal can back up your dishwasher since they share plumbing, as can a clog in your kitchen sink’s plumbing. A handy DIYer may be able to figure out how to unclog a dishwasher, but you may need to call in a plumber if you can’t locate and clear the clog yourself.

Maintenance includes regular filter cleaning, checking water connections, and ensuring that the unit operates at optimal efficiency without blockages.

DIY installation or repair is possible with the right skills and tools, but if not done correctly, it can often lead to water leaks or improper connections.

Most repairs take 1-3 hours, but complex issues requiring part replacements may take longer if parts need to be ordered.

Yes, a dishwasher needs an air gap to prevent backflow. Additionally, in many locations, air gaps or another measure to prevent backflow are required for building code compliance. There are alternatives to an air gap, like a Studor vent or a loop and trap design, but an air gap is the simplest and most popular solution.

The Glendale, CO homeowners’ guide to dishwasher installation services

From average costs to expert advice, get all the answers you need to get your job done.

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