How to Fix a Dishwasher That Won’t Drain – Step-by-Step Guide

Introduction

A dishwasher that won’t drain can leave standing water at the bottom, causing frustration and potential water damage. This guide will walk you through the most common reasons why your dishwasher isn't draining and how to fix it. Follow these simple troubleshooting steps before calling a repair technician.

1️⃣ Check & Clean the Dishwasher Filter

Why? Over time, food particles and debris can clog the dishwasher filter, preventing water from draining properly.

✅ Steps to Clean the Filter:

  1. Locate the filter at the bottom of the dishwasher (near the spray arm).
  2. Twist and remove the filter.
  3. Rinse it under warm water and use a brush to remove debris.
  4. Reinstall the filter and test the dishwasher.

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2️⃣ Inspect the Drain Hose for Clogs

Why? A kinked or clogged drain hose can stop water from exiting the dishwasher.

✅ Steps to Check & Unclog the Drain Hose:

  1. Unplug the dishwasher and turn off the water supply.
  2. Locate the drain hose (usually connected to the garbage disposal or sink drain).
  3. Disconnect the hose and inspect for blockages.
  4. Use a plumber’s snake or a straightened wire hanger to remove debris.
  5. Reconnect the hose and test the dishwasher.

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3️⃣ Check the Garbage Disposal Connection

Why? If the garbage disposal was recently installed or clogged, it can prevent the dishwasher from draining.

✅ Steps to Fix:

  1. If your dishwasher drain hose is connected to the garbage disposal, check if there’s a blockage.
  2. Run the disposal to clear any food debris.
  3. Ensure the knockout plug inside the disposal inlet has been removed (common with new installations).
  4. Restart the dishwasher and see if it drains properly.

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4️⃣ Test the Dishwasher Drain Pump

Why? If the drain pump is faulty, it may prevent water from being expelled.

✅ Steps to Check & Replace the Drain Pump:

  1. Unplug the dishwasher and remove the lower kick plate.
  2. Locate the drain pump (near the bottom of the unit).
  3. Check for blockages in the pump impeller.
  4. If damaged, replace the drain pump with a compatible model.

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5️⃣ Run a Vinegar & Baking Soda Flush

Why? A natural cleaning solution can help break down minor clogs and odors.

✅ Steps:

  1. Pour 1 cup of white vinegar into a dishwasher-safe bowl and place it on the top rack.
  2. Run a hot water cycle.
  3. Sprinkle 1 cup of baking soda in the bottom of the dishwasher and run another short cycle.

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Conclusion

If your dishwasher is still not draining after following these steps, you may need professional assistance. However, most drainage issues can be fixed with simple DIY methods. For more in-depth troubleshooting and repair instructions, download a detailed dishwasher repair manual below:

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🚀 By following this guide, you can potentially save hundreds of dollars on dishwasher repairs!