Dishwasher Not Draining? Here’s Why and How to Fix It

Safety Notice

This guide covers basic checks that most homeowners can safely perform. Some appliance repairs involve electrical components or internal systems that can cause injury if handled incorrectly. If you are unsure about any step, stop and contact a qualified technician. Max Appliance Repair Miami is not responsible for any damage or injury resulting from DIY repair attempts.

You run the dishwasher, open it up, and there is a pool of dirty water sitting at the bottom. The dishes went through a full cycle and the water just stayed. Before you call anyone, know that this is one of the most common dishwasher problems out there, and most of the time the fix takes less than 20 minutes.

Why Is My Dishwasher Not Draining?

Your dishwasher drains through a chain: water flows from the tub, through a filter, past a pump, and out through a drain hose into your sink drain or garbage disposal. Any blockage or failure along that chain stops the water from leaving. Here are the six most common reasons it happens.

Clogged Filter

The most common cause. Food debris, grease, and grime build up in the filter at the bottom of the tub until water cannot pass through. Most people never clean it.

Blocked Drain Hose

The hose that carries water from the dishwasher to your sink drain can kink, clog with grease buildup, or get blocked where it connects to the disposal or drain.

Garbage Disposal Knockout Plug

If you recently installed a new garbage disposal, a plastic knockout plug inside the dishwasher inlet port must be removed. If it was not removed, water has nowhere to go.

Clogged Air Gap

Some kitchens have an air gap fitting on the countertop near the sink. It prevents backflow but clogs easily with debris. A clogged air gap stops drainage completely.

Faulty Drain Pump

The drain pump forces water out of the tub. If it fails or something jams the impeller, water sits in the bottom regardless of how clean everything else is. This requires a technician.

Clogged Sink Drain

Your dishwasher drains into the same line as your sink. If the sink drain is slow or blocked, dishwasher water backs up into the tub.

Diagnose It in 2 Minutes

What you notice	Start here
Standing water after every cycle	Clean the filter first
Sink drains slowly at the same time	Clear the sink drain
Just installed a new garbage disposal	Check the knockout plug
Water spitting out of the air gap on the counter	Clean the air gap
Filter and hose are clear but water still sits	Likely a drain pump issue — call a technician

What You Can Safely Check

Clean the Filter

This solves the problem more than half the time. Always make sure the dishwasher is off before reaching inside.

Step 1. Remove the bottom rack and locate the cylindrical filter at the center of the tub floor.

Step 2. Twist it counterclockwise and lift it out. Some models have a flat mesh filter underneath — remove that too.

Step 3. Rinse both parts under warm running water and scrub with an old toothbrush.

Step 4. For heavy buildup, soak in warm soapy water for 10 minutes before scrubbing.

Step 5. Reinstall the filter, run a short cycle, and check if water drains.

Pro tip: Clean the filter once a month if you run the dishwasher daily. Most drainage problems never happen when you keep up with this one step.

Check the Drain Hose for Kinks

Open the cabinet under the sink and trace the drain hose from the dishwasher to where it connects. Look for visible kinks and straighten them. Make sure the hose loops up high before connecting. If you need to disconnect the hose, make sure the dishwasher is off and have towels ready.

Clean the Air Gap

Unscrew or pop off the cap on top of the air gap, remove the plastic cover underneath, clean out any debris, and reassemble.

Check the Sink Drain

Run your sink and watch how quickly it drains. If it is slow, clearing the sink drain with a plunger is often enough to restore dishwasher drainage too.

Important: If your filter and hose are clear and the dishwasher still will not drain, do not attempt to access the drain pump yourself. Contact a qualified technician.

Filter Clean, Hose Clear, Still Not Draining?

At that point the drain pump is likely the culprit. This involves electrical components and should be diagnosed and repaired by a qualified technician. Our team handles dishwasher issues same day across Miami and South Florida.

See Our Dishwasher Repair Service

How to Stop It From Happening Again

Clean the filter once a month. The single most effective maintenance step for preventing drainage problems.

Scrape plates before loading. Large food pieces are the main reason filters clog so quickly.

Run hot water in the sink before starting a cycle. It primes the temperature so the dishwasher does not spend the first few minutes heating cold water.

Run a cleaning cycle monthly. A cup of white vinegar on the top rack, no dishes, hot cycle. Dissolves grease before it builds into a blockage.

Frequently Asked Questions

Is it safe to run a dishwasher that is not draining?

No. Running it with standing water at the bottom strains the drain pump. Fix the cause before running another cycle.

How do I get standing water out of my dishwasher right now?

Use a cup or ladle to scoop most of it out, then soak up the rest with towels. Once the tub is dry you can access and clean the filter properly.

Why does my dishwasher drain slowly but not completely?

A partial blockage in the filter or drain hose is almost always the reason. Clean the filter and check the hose for partial kinks.

How much does it cost to fix a dishwasher that won’t drain?

If the fix is a clogged filter or kinked hose, it costs nothing. When parts or a technician visit are needed, costs vary depending on the appliance brand, model, and the specific issue. We always recommend getting a quote upfront.

Related Services

Standing water in the dishwasher looks worse than it usually is. Nine times out of ten a dirty filter is all it is, and cleaning it takes five minutes. Start there and work your way down the list.