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>

Why does a dishwasher have to drain through the sink plumbing?

• <div><p>Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.</p></div>

Best dishwasher installation pros near Boston, MA

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Verified Reviews for Dishwasher Installation pros in Boston, MA

*The Angi rating for Dishwasher Installation companies in Boston, MA 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 Boston, MA 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 21, 2026

Reviewed in September 2026
Our dishwasher was leaking. FixVerse came, diagnosed the problem, and returned with a new diverter pump. Once it was replaced, the leak stopped. I recommend FuxVerse with no reservation whatsoever.
FixVerse LLC
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Reviewed in September 2025
Installation was quick, professional, and the tech even showed me how to use the new opener.
Alamo Garage Doors
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Reviewed in September 2023
The job required 15 minutes at the most. I provided the installation kit I purchased separately.
Mir HVAC & Appliances Technician
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Reviewed in June 2023
Nick was great; responded quickly, kept in touch; knew what he was doing and delivered. Helped me out on an extra task at a reasonable price. I was pleased with the quick turnaround. Gave good advice about limiting the spend on an older dishwasher too. Iâ d use him again without qualm.
Apex Appliance Repair
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Reviewed in April 2023
Leo was super helpful and went above and beyond what I expected from a repairman. After investigating the issue free of charge, he let me know that it would likely be cheaper to replace it. He helped me search for a replacement washer/dryers and then helped install it after it was delivered. He...
A.E.T Services, LLC
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Reviewed in November 2022
Solid pro! Needed a dishwasher pump replaced, and the problem was diagnosed, and repaired at a very reasonable cost as soon as the part was located. Great communication and easy payment!
Appliance Repair Genie
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Reviewed in May 2022
It was the finest professional installation and craftsmanship that I had ever encountered.
Prestige Restoration flooring
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Reviewed in November 2021
Don responded to my request for a new thermostat very quickly and installed everything within a few hours of my call. And did a great job.
Luxury Comfort Systems, LLC
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Reviewed in April 2021
Went above and beyond on gas range and dishwasher install. Gas line was old and had issuers but felt safe knowing how professional he was! Personable and informative. Will for sure be using again.
BD Handyman Services
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Reviewed in January 2021
I was having problems with my dishwasher draining the water leaving me with a small pool in my kitchen so i called Silc Appliance Repair and they were amazing! I spoke to a very nice gentleman named Brian, he took care of everything and my dishwasher was like brand new in no time! 10/10!
SILC Appliance Repair
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Top-Rated Dishwasher installation pros in Boston - Updated Nov 2026

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Dishwasher Installation FAQs, 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.

Costs depend on labor rates, replacement part prices, brand, and whether emergency service is required.

Any drain in your house requires a water trap to prevent sewer gases from entering the home. Dishwashers don’t have an internal water trap, so they must use an external P trap. The most convenient P trap for the dishwasher is already in the plumbing under your sink.

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.

Repairs typically cost between $150 and $600, depending on the issue, parts needed, and labor charges.

The Boston, MA homeowners’ guide to dishwasher installation services

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

See all articles

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