Dishwasher Not Draining? Causes and Solutions

Finding a pool of dirty water at the bottom of your dishwasher after a cycle is a clear sign something is wrong. Most drainage problems come down to a blockage somewhere in the system. Here are the most common causes and what you can do about them.

1. Clogged Filter

Most modern dishwashers have a filter at the bottom that catches food particles. When it gets clogged with debris, water can't drain properly. Cleaning this filter is one of the easiest fixes — remove it, rinse it under warm water, and clear any trapped food.

2. Blocked Drain Hose

The drain hose carries water from the dishwasher to your sink drain or garbage disposal. Food, grease, or kinks in the hose can block the flow. A blocked hose is a very common cause of standing water.

3. Garbage Disposal Connection

If your dishwasher drains through your garbage disposal, a clog in the disposal — or a plug that was never removed after a new disposal was installed — can stop the dishwasher from draining. Running the disposal first sometimes helps.

4. Failed Drain Pump

The drain pump pushes water out of the dishwasher. If it burns out or gets jammed with debris like broken glass, water stays in the tub. You may hear a humming sound without any draining. A failed pump usually needs replacing.

5. Clogged Air Gap

If your sink has an air gap (a small cylinder on the counter near the faucet), it can get clogged and stop the dishwasher from draining. Cleaning it out is often a simple fix.

When to Call a Professional

If you've cleaned the filter, checked the hose, and run the disposal but water still won't drain, the pump or another internal part may have failed. Our team offers same-day dishwasher repair across Walnut Creek to get your dishes clean again.

Frequently Asked Questions

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