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What Is a Blocked Dishwasher Drain? How to Get It Flowing Again

Andy

Have you opened your dishwasher after a cycle, only to find standing water and dirty dishes? 

A blocked dishwasher drain can be frustrating, but it’s a common issue many homeowners face. Luckily, most blocked dishwasher drains are manageable with a few simple steps.

In this guide, we’ll walk you through the exact steps you need to fix a blocked dishwasher drain, clear out debris, and get your dishwasher working properly again. 

Whether you’re wondering how to fix a blocked dishwasher drain or how to drain a blocked dishwasher, we’ve got you covered.

Why Is My Dishwasher Drain Blocked?

Before we dive into the steps, let’s briefly look at the common causes of a blocked dishwasher drain:

  • Food debris and grease can accumulate in the filter or drain.
  • Mineral deposits from hard water may build up in the pipes.
  • A kinked or blocked drain hose can prevent proper drainage.
  • Mechanical issues with the drain pump or faulty plumbing connections may also contribute to a blocked drain.

Now that we know why it happens, let’s explore the steps to get your dishwasher draining properly again.

Steps to Unblock Your Dishwasher Drain

Unblocking your dishwasher drain is simple with a few key steps—remove any standing water, clean the filter, check the drain hose for blockages, and use a drain rod if needed, all while ensuring safety and efficiency throughout the process.

Remove Your Dishes

Start by removing any dishes from your dishwasher. You might need to wash them again after you’ve fixed the drain. Clearing the appliance ensures that you don’t accidentally make the situation worse while working on the drain.

Check Your Garbage Disposal

If your dishwasher is connected to the garbage disposal, check to see if it’s blocked. A backup in the garbage disposal can cause water to remain in the dishwasher after a cycle. Turn on the garbage disposal to see if that resolves the issue.

If that doesn’t work, proceed with the next steps.

Disconnect Your Dishwasher from Power

For your safety, disconnect the dishwasher from the power source before you proceed. Unplugging the dishwasher or turning off the circuit breaker is essential to avoid any risk of electrical shock.

Remove Any Standing Water

Before you start troubleshooting the source of the blockage, remove any standing water inside the dishwasher. You can use a cup or a small container to scoop the water out. Afterwards, soak up any remaining water with towels. This will make it easier to inspect the drain and clear any blockages.

Clean the Drain

A blocked dishwasher drain is often caused by food debris and grease buildup, so cleaning it regularly is essential for ensuring smooth water flow and preventing blockages.

Clean the Dishwasher Drain

It’s common for food debris, grease, and soap scum to accumulate in the dishwasher drain, causing a blockage. 

To clean the dishwasher drain:

  • Remove the drain filter from the bottom of the appliance. This filter is typically located at the bottom of the dishwasher.
  • Rinse the filter under running water to remove any trapped debris or food particles.
  • Once the filter is clean, replace it and move on to the next step.

Check the Filter

If the dishwasher drain blockage issue persists, it might be due to a dirty dishwasher filter. Make sure to remove the filter regularly (at least once a month) and clean it thoroughly to prevent debris from building up over time.

Clean Your Sink’s Air Gap

If your dishwasher is not draining properly and you don’t have a garbage disposal, the issue might lie with the sink’s air gap. The air gap is a small, slotted cylinder found next to the sink tap. It’s designed to prevent backflow of water into the dishwasher.

To clean the air gap:

  1. Remove the air gap by turning it counterclockwise.
  2. Use a stiff brush to clean out any debris or buildup inside the air gap.
  3. Replace the air gap and secure it back in place.
  4. Run a test cycle to check if this resolves the drainage issue.

Check and Clean the Drain Hose

The drain hose could be another cause of the blockage. To check and clean it:

  1. Disconnect the dishwasher from the power source and remove any standing water.
  2. If necessary, pull the dishwasher away from the wall to access the drain hose.
  3. Inspect the hose for any kinks or twists that could be blocking water flow.
  4. If the hose appears fine but you suspect a blockage, disconnect the hose and flush it with hot water to clear any debris.
  5. If the hose is excessively blocked, consider replacing it.

How to Prevent Dishwasher Blocks

To avoid future blockages, regular dishwasher maintenance is essential. Here are a few tips to keep your appliance in top shape:

  • Rinse your dishes before loading them into the dishwasher. This will prevent large food particles from blocking the drain.
  • Clean the filter monthly to remove food debris and grease.
  • Use a hot water cycle to help remove any buildup.
  • Clean both the interior and exterior of your dishwasher regularly to prevent blocks.
  • Run the dishwasher often rather than letting it sit idle for prolonged periods.

To Sum Up: Get Your Dishwasher Flowing Again

A blocked dishwasher drain is a common but fixable issue that many homeowners encounter. 

By following the steps outlined above, cleaning the filter, checking the drain hose, and inspecting the air gap, you can often resolve the problem yourself. 

Regular maintenance is key to preventing future blocks and ensuring your dishwasher operates smoothly.

Need help with your dishwasher’s blocked drain or won’t drain problem? Contact Block Drain Plumber Sydney for professional assistance and quick solutions!

FAQs

1. How do I unblock my dishwasher drain?

To unblock your dishwasher drain, start by checking the filter and drain hose for any blockages. Clean the drain, check the garbage disposal, and inspect the air gap and drain pump. If the problem persists, use a drain cleaner or contact a professional.

2. How can I force my dishwasher to drain?

If your dishwasher won’t drain, remove standing water, clean the filter, and check the drain hose for blockages. 

3. What to do if the dishwasher is not draining?

First, check for standing water and remove it. Clean the drain and filter, inspect the drain hose for kinks or blockages, and clean the air gap if necessary. If the dishwasher still won’t drain, you may need to call a professional plumber.

Andy Quinn

Founder

Andy Quinn is the founder of Blocked Drain Plumber Sydney, a family-owned plumbing business serving Sydney with over 63 years of combined industry expertise. Andy and his team specialize in delivering reliable solutions for everything from blocked drains to emergency plumbing, ensuring quality service and customer satisfaction.