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 Wellston, MO

*The Angi rating for Dishwasher Installation companies in Wellston, MO 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 Wellston, MO 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 September 25, 2025

Reviewed in September 2025
We were connected through our Home Warranty coverage. He came on time in service window, was completely professional, focused on the job and got it done. Dishwasher is now working! Very grateful.
Speed Service
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Reviewed in July 2025
Installation was fast and smooth. And seller was very respectable on time and clean.
Mad City Windows & Baths
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Reviewed in March 2025
The team did a great job installing
Chesterfield Fence & Deck Co., Inc.
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Reviewed in February 2025
I hired Midtown Home Improvements, Inc. to replace 20 windows with triple pane windows, a front door, and a sliding patio door. The job was completed in April of 2023. I had the absolute best installers. They were a team of 3, who were extremely knowledgeable, punctual, and tidy. They...
Midtown Home Improvements, Inc. (St. Louis)
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Reviewed in October 2024
I was contacted immediately and he was able to show up the same day. He installed a new garbage disposal but only after trying to save the old one. He also picked up a couple of bathroom jobs for the sink and toilet. Very personal and courteous. I would 100% recommend Andre at A1.
A1 Installs
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Reviewed in December 2023
worked quickly, explained possible reasons for bugs in my dishwasher, explained what he was doing to eliminate them. Very quickly the few bugs I continued to see were clearly poisoned as they no longer could move away from me as I snatched them with paper towels and got rid of them. It took...
Healthy Home Pest Control & Services
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Reviewed in October 2022
I was given an honest opinion that my dishwasher may be beyond repair. They tried a couple of different things with my consent but parts needed for 20 year old dishwasher were no longer available.
All American Appliance Service Inc
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Reviewed in July 2022
Our plumber was very conscientious, arrived well before the scheduled time and had to work very hard to remove the old dishwasher as several previous changes in the kitchen had affected the setting of the unit. The removal accounted for the greatest portion of the time & cost. The subsequent...
Bieg Plumbing & Mechanical
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Reviewed in March 2022
Excellent work - professional installer s attention to detail and cleaned up
HALLMARK STONE CO
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Reviewed in September 2021
Cynthia the owner was friendly and very helpful. The installers were knowledgeable and cleaned up after completion.
C&R Communications
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Dishwasher Installation questions, answered by experts

If your dishwasher keeps filling with water at the bottom but doesn’t fill into the sink, the issue is likely due to a blockage within the dishwasher or drain. Regularly clean your dishwasher filter basket to ensure it’s not clogged with food, and run a vinegar rinse periodically if you have hard water to remove limescale buildup.

Only if the dishwasher isn’t made of stainless steel. The corrosive chemicals in bleach will stain stainless steel and can also cause further damage. To stay on the safe side, stick with an extra cycle of vinegar to banish any lingering odors.

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters.

Professional repair is advisable for electrical issues, refrigerant leaks, or unfamiliar problems. Technicians can accurately diagnose and fix such problems, ensuring safety and appliance longevity.

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.

The Wellston, MO 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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