Dishwasher Not Draining After Installing New Garbage Disposal: Easy Fixes You Can Do

Dishwasher not draining after installing new garbage disposal? You’re not alone. This is a common issue that many homeowners face, but the good news is that it’s generally easy to resolve. This article will provide you with a detailed, step-by-step guide to help you fix this problem.

Dishwasher Not Draining After Installing New Garbage Disposal
From by Serena Koi

Why Is My Dishwasher Not Draining After Installing New Garbage Disposal?

There are a few reasons why your dishwasher might not be draining after you’ve installed a new garbage disposal. Below, we’ll explore these reasons and provide step-by-step instructions for each possible fix.

Check the Garbage Disposal Plug

The garbage disposal unit often comes with a plug that covers the port where the dishwasher’s drain hose is supposed to connect. This is typically a safety feature for installations where a dishwasher is not being used. However, if you have a dishwasher, this plug must be removed to allow the dishwasher to drain properly.


Turn off the garbage disposal and unplug it from the electrical outlet. Before performing any work on electrical appliances, always make sure they are disconnected from power sources to ensure your safety.

Use a flashlight to look into the dishwasher drain hose inlet located on the side of the garbage disposal. This port is typically near the top of the unit and is the spot where the dishwasher drain hose connects to the garbage disposal.

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If you see a plug, use needle-nose pliers to carefully remove it. Carefully grip the edge of the plug with your pliers and pull it out. Ensure you have a good grip to avoid damaging any internal components.

After removing the plug, reconnect the dishwasher drain hose and secure it with a hose clamp. The hose clamp ensures that the hose stays securely attached, preventing leaks.

Plug the garbage disposal back in and run a dishwasher cycle to see if the issue is resolved. After reassembling everything, test your system to ensure that the issue has been resolved.

Examine the Drain Hose

The drain hose could also be the culprit. Over time, gunk and food particles can clog up this hose, leading to drainage problems.


First, unplug the dishwasher and the garbage disposal from their respective electrical outlets. As a precautionary measure, always disconnect appliances from electricity before working on them.

Disconnect the drain hose from the garbage disposal. Usually, this involves loosening a hose clamp and carefully pulling the hose off the nozzle.

Use a straightened coat hanger to remove any potential blockages from the hose. Insert the straightened hanger into the hose and gently push it in and out to clear out any debris or blockages.

Reattach the hose and secure it with a hose clamp. Ensure that the hose fits snugly over the nozzle and tighten the hose clamp to avoid any potential leaks.

Plug the devices back in and run a dishwasher cycle. Perform a test to see if the problem has been fixed.

Inspect the Air Gap and Check Valve

Air gaps and check valves are designed to prevent water from flowing back into the dishwasher, which can be especially useful in preventing cross-contamination between the sink and dishwasher. However, if these components are clogged or faulty, they can inhibit proper drainage.

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Locate the air gap on the top of your sink and remove the cover. The air gap is usually a small cylindrical device that protrudes from the top of the sink.

Clean any debris you find. Use a small brush or cloth to clean out any visible debris. This can often restore proper function.

If your dishwasher has a check valve, refer to the manufacturer’s guide to locate and inspect it. Check valves are typically located inside the dishwasher, often near the drain.

Replace any faulty components. If you find that either the air gap or check valve is not functioning properly, replace it with a new component.

Run a test cycle to confirm if the issue has been resolved. After cleaning or replacing the components, run a cycle to ensure that the dishwasher is draining as it should.

For more articles on dishwashers, click here: Dishwasher Problems and Solutions: Your Ultimate Guide to Hassle-free Dishwashing

Conclusion: Dishwasher Not Draining After Installing New Garbage Disposal

By following these steps, you should be able to identify and fix the reason why your dishwasher is not draining after installing a new garbage disposal. If the problem persists, it may be best to consult a professional.