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>

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Verified Reviews for Dishwasher Installation pros in Campbell, CA

*The Angi rating for Dishwasher Installation companies in Campbell, CA 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 Campbell, CA 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 25, 2026

Reviewed in February 2026
I called Sonic appliances in the morning, and Rabin and John showed up in the afternoon on time, diagnosed the problem with my rental’s Kenmore dishwasher rack and Samsung icemaker problems. The initial diagnose cost was very reasonable and included in the total cost of repairs. The repair...
Sonic Appliances Repair
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Reviewed in October 2024
Bay Remodeling Kitchen & Bath has excellent craftsmanship. The finished product reflects the careful installation of each cabinet, countertop, and fixture. I constantly receive compliments on how beautiful my kitchen looks!
Bay Remodeling Kitchen & Bath
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Reviewed in August 2024
Installer was very professional, polite, and completed faucet replacement quickly and efficiently.
RB Plumbing Services Inc
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Reviewed in May 2023
Three tasks performed: - Replace exterior shut-off valve, - Install kitchen faucet (difficult to remove old one) - Replace leaking p-trap under kitchen sink
Aaron's Plumbing & Rooter
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Reviewed in November 2021
Our water heater broke at 4:00 the day before Thanksgiving. He arrived within two hours and installed the whole thing in two hours. It works beautifully and saved our holiday.
Chandler's Plumbing
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Reviewed in August 2021
Excellent service. Juan analyzed the problem quickly, left to get the part and returned within the hour and installed it. Courteous and reasonably priced.
jd sons general builders inc
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Reviewed in June 2021
Rescued me from an out of plumb wall. Installed the glass shower doors beautifully. Reasonable price for the doors included great service.
Horse Glass
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Reviewed in January 2021
Nice man-very knowledgable and friendly. He showed up the same day and not only fixed the problem with my dishwasher, but showed me how to take care of it in the future
Happy Again Appliance Service
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Reviewed in August 2020
Frank from Agile Appliances answered our late-in-the-day Friday call and was able to come right over since he had a cancelled call. He was very professional and courteous, even asking if we wanted him to remove his shoes at the door. He carefully diagnosed the problem - identifying it as the...
Agile Appliance and Refrigeration Repair
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Reviewed in May 2020
Installation process was quick,efficient and completed in one day. Installers were efficient and knowledgeable.
Comfort Energy, Inc.
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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.

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.

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.

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

While the exact appearance of the filter will depend on your dishwasher brand, it often consists of a cylindrical or rectangular mesh or plastic component. The filter is located at the bottom of the dishwasher beneath the lower spray arm. It includes a combination of a coarse filter, which traps larger food particles, and a finer filter, which captures smaller debris. The filter assembly may be a single unit or a multi-part system that can be twisted or snapped out for cleaning.

The Campbell, CA 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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