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Causes Why the Sink Fills Up When You Run Your Dishwasher

w.h. winegar sink fills up when you run your dishwasher

If your sink fills up when you run your dishwasher, there might be several possible reasons.

Your sink filling up with water while your dishwasher is operating can be an alarming situation that may make homeowners panic. Fortunately, this problem is not uncommon and might often be resolved with a bit of troubleshooting. Keep reading for the causes and solutions of when your sink fills up when you run your dishwasher.

Prevalent Reasons & Solutions

If your sink fills up when you run your dishwasher, there might be several possible reasons. Here are some of the prevalent reasons why this happens and some troubleshooting tips you may follow:

Drain Clogs

A drain clog is one of the primary culprits for why your sink fills up when you run your dishwasher. Over time, food particles, debris, and grease can gather in the sink and dishwasher drains, restricting the water flow. As your dishwasher pumps out water, the clog may cause a backup, leading to water filling the sink.

Solution? Attempt to dislodge the nasty clog with a plunger. If that doesn’t work, try a drain snake or a mixture of any vinegar and baking soda to break down the blockage. Regularly cleaning the dishwasher and sink drains can help prevent potential clogs.

Air Gaps

An air gap is an item that prevents wastewater from returning to the dishwasher. If the air gap is improperly installed or blocked, it may lead to drainage problems. So, make sure to inspect the air gap for any obstructions and confirm it’s properly connected. Also, clean the air gap periodically to prevent buildup that may hinder proper drainage.

Clogged Garbage Disposal

A clogged garbage disposal might be another reason your sink fills up when you run your dishwasher. Unfortunately, this can keep the dishwasher from draining effectively, resulting in water backup in the sink. To solve this problem, clear any garbage disposal clogs and ensure it works properly. If necessary, consult professional assistance or the manufacturer’s instructions.

Fortunately, the W.H. Winegar & Son Plumbing and Heating team may eliminate jams from your garbage disposal or pinpoint the problem without causing more issues. As a result, hiring professionals with years of experience repairing garbage disposals is your ideal bet for avoiding potential problems. Contact us today at 301-384-5818!

Ventilation Problems

Every plumbing system needs proper ventilation to ensure smooth drainage. If the plumbing vents are obstructed or clogged, it may create negative pressure in the pipes, leading to drainage problems. So, it’s best to consult our plumbing company if you suspect a plumbing vent issue. We can ensure proper drainage throughout your plumbing system!

When to Contact a Plumbing Pro

A sink filling with water while running the dishwasher can be provoked by multiple factors, ranging from simple clogs to more complicated plumbing issues. You may restore proper drainage and prevent this inconvenience by identifying the root cause and practicing the appropriate troubleshooting tips.


If you’re seeking plumbing or heating repairs, replacements, or other solutions, look no further than W.H. Winegar & Son Plumbing and Heating! With decades worth of industry experience, our leading professionals are guaranteed to find incredible solutions to all your plumbing and heating problems. Now that you know us, let us get to know you! If you are curious about any of our business services, reach us by telephone at 301-384-5818 or fill out this contact form, and one of our representatives will contact you shortly. Make sure to follow us on Facebook and LinkedIn!

This entry was posted on Monday, October 2nd, 2023 at 11:12 am. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.