Why Is My Dishwasher Not Draining? (Quick Fixes + Complete Guide)
Quick Fix: The #1 cause of a dishwasher not draining is a clogged filter. Remove and clean the filter at the bottom of your dishwasher tub, this fixes most drainage problems in under 5 minutes.
Video guide
Video: “How To Fix a Dishwasher That Won’t Drain” by The BeefMaster
A faulty pump won’t start, leading to water backing up into the basin and causing that nasty mess at the bottom of your dishwasher. You’ll want to check if the pump’s 120V motor has tripped the breaker or if it simply fails to engage, losing prime without giving any warning signs. If this persists, a new pump from Haviland at around $85 might be your best bet, but first try resetting the circuit breaker and ensuring the dishwasher’s water supply valves are fully open.
Good news: most dishwasher drainage problems are easy DIY fixes. In this guide, you’ll learn the six most common causes of water not draining from your dishwasher and exactly how to fix each one, no special tools required for most repairs.
What You’ll Need
Before you start troubleshooting, gather these basic supplies:
- Towels, For soaking up standing water
- Flashlight, To see inside the dishwasher tub and under the sink
- Flat-head screwdriver, For removing access panels if needed
- Dish soap and soft brush, For cleaning the filter
- Wet/dry vacuum (optional), Makes removing standing water much faster
- Multimeter (optional), Only needed if you’re testing the drain pump
Most fixes require nothing more than your hands and a flashlight. Don’t let the list intimidate you, the first thing you should try (cleaning the filter) needs zero tools.
Is Standing Water Normal?
Here’s something that surprises many people: a small amount of water at the bottom of your dishwasher is normal.
Ensure the sump area retains roughly a quarter-inch of water; this moisture is vital for keeping the seals and gaskets from drying and potentially cracking.
Easy to miss.
How to tell if you have a problem:
- Normal: Water barely covers the bottom of the filter area (about 1/4 inch or less)
- Problem: Water is 1 inch or deeper, visible above the filter housing
- Quick test: Stick your finger in the water. If it’s above your first knuckle, you have a drainage issue
If your dishwasher is not draining completely but you only see a thin layer of water, that’s likely normal operation, not a clog.
6 common causes (and how to fix each)
Let’s work through the most likely culprits, starting with the easiest fix.
1. clogged filter (most common)
When the KitchenAid Filter Cleaner, rated at $10 for particle capacity, is maxed out with trapped debris, expect a noticeable drop in water flow. Inspect and clean this filter regularly; otherwise, poor drainage could make your dishwasher underperform or trip your home’s circuit breaker by overloading the drain line.
Where to find it: Look at the bottom center of your dishwasher tub. You’ll see a cylindrical filter assembly, usually with a twist-lock mechanism.
How to clean it:
Remove the bottom rack. Twist off the filter counterclockwise and lift upward; rinse under hot water to dislodge loose particles. Employ a soft-bristled brush with dish soap for tougher grime. Next, inspect the sump area, the hole where the filter rests, for lingering debris. Reinsert the clean filter and twist clockwise until snug.
Signs the filter is your problem:
- Visible food debris on the filter mesh
- Water drains slowly rather than not at all
- You can’t remember the last time you cleaned it
Prevention tip: Clean your filter monthly. Mark it on your calendar, a dirty filter is the cause of most dishwasher drainage complaints.
2. blocked drain hose
A dishwasher’s drain hose transfers water to the garbage disposal or sink drain; ensure it isn’t kinked or stopped up, as a blockage prevents proper drainage.
Common mistake.
Where to find it: Open the cabinet under your sink. You’ll see a ribbed plastic hose connecting your dishwasher to the disposal or drain pipe.
Check for kinks first: This is the most common drain hose issue. The hose can get kinked when you push items under the sink or if it wasn’t installed properly. Straighten any kinks you find.
The high loop requirement: Your drain hose should loop up near the top of the cabinet before connecting to the drain. This “high loop” prevents dirty sink water from flowing back into your dishwasher. If your hose runs straight across the bottom of the cabinet, that’s an installation problem that can cause drainage issues.
For more details on proper installation, see our drain hose problems guide.
If you suspect a clog:
Turn off power to the dishwasher first for safety. Place a bucket under the hose connection next to catch drips. Carefully disconnect the hose from the disposal or drain. Run water through the hose to check for blockages; use a long brush or straightened wire hanger if needed. Reattach the hose and test the connection afterward to ensure everything works properly.
3. garbage disposal connection
If your dishwasher drains through your garbage disposal (most do), problems with the disposal can prevent your dishwasher from draining.
The knockout plug problem: Did you recently install a new garbage disposal? Most new disposals come with a solid plastic plug blocking the dishwasher inlet. If nobody removed this plug during installation, your dishwasher has nowhere to drain.
To check: Shine a flashlight into the disposal. Look for the dishwasher inlet (a small hole on the inside wall). If it’s blocked by plastic, you’ll need to knock out the plug with a hammer and screwdriver, then remove the plastic piece from inside the disposal.
Quick disposal check:
First, run your garbage disposal for 15-20 seconds to ensure it is functioning properly. Next, if the disposal drains slowly, clear it as necessary; this step helps maintain its efficiency and prevents future issues. Always run your disposal before starting a dishwasher cycle, ensuring that any food particles are thoroughly processed and preventing blockages in the pipes.
A clogged disposal backs up water into your dishwasher. Clear the disposal, and your dishwasher drainage may fix itself.
4. air gap clog
Not every kitchen has an air gap, but if yours does and it’s clogged, your dishwasher won’t drain properly.
What is an air gap? It’s a small cylindrical fitting mounted on your sink or countertop, usually next to the faucet. It prevents contaminated water from flowing back into your dishwasher, a requirement under the Uniform Plumbing Code in many states.
How to clean it:
First, remove the decorative cap by twisting or popping it off; next, take out the inner protective cap. Then, clean any debris from inside using a bottle brush or paper towel. After that, check both the inlet and outlet tubes for blockages. Finally, replace both caps to ensure everything is properly secured.
If water sprays out of your air gap during a dishwasher cycle, that’s a clear sign of a blockage somewhere in the drain path.
5. drain pump failure
If you’ve checked everything above and your dishwasher still won’t drain, the drain pump may have failed.
Signs of pump failure:
- Humming sound but no drainage: The motor is trying to run but the impeller is stuck or damaged
- Complete silence: The pump motor may have burned out
- Intermittent draining: The pump works sometimes but not consistently
Where it’s located: The drain pump sits at the bottom of your dishwasher, beneath the tub. Accessing it typically requires removing the lower front panel.
When to suspect the pump: Only after you’ve ruled out the filter, hose, disposal, and air gap. Pump failure is less common than simple clogs.
For testing procedures and replacement guidance, see our complete drain pump issues guide.
6. check valve stuck
The check valve is a small but important component that prevents water from flowing back into your dishwasher after it drains.
Small detail, real impact.
What it does: Think of it as a one-way door. Water goes out, but can’t come back in.
Where to find it: Usually located where the drain hose connects to the pump, or inside the drain hose itself near the disposal connection.
Signs of check valve failure:
- Water drains, then comes back into the dishwasher
- Standing water appears after the dishwasher has been sitting unused
- You hear gurgling sounds from the dishwasher when running the sink
How to check it:
First, locate the check valve as directed by your owner’s manual; next, remove it to inspect for any debris or damage; then ensure that the flapper moves freely in just one direction; finally, clean or replace the flapper if it is stuck or damaged.
If you’ve checked everything else and there’s no visible blockage, a stuck check valve is often the hidden culprit.
Step-by-step troubleshooting
Follow this order to diagnose your dishwasher drainage problem efficiently:
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Cancel the cycle and remove standing water. Use towels or a wet/dry vacuum to remove as much water as possible. This gives you access to check components.
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Clean the filter. This fixes the majority of drainage problems. Even if you think it’s clean, remove it and rinse it thoroughly.
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Check the drain hose for kinks. Open the cabinet under your sink and trace the hose. Straighten any bends or kinks.
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Inspect the garbage disposal connection. Run the disposal to clear it. If you have a new disposal, check that the knockout plug was removed.
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Clean the air gap (if you have one). Remove the cap and clear any debris from both tubes.
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Run a test cycle. Start a short wash cycle and watch for proper draining at the end.
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If still not draining, check the pump. Listen for humming or silence during the drain cycle. A multimeter can confirm if the pump motor has failed.
Brand-specific tips
Different dishwasher brands display error codes that can help you diagnose drainage problems:
Samsung: Error codes 5C, 5E, or SC indicate a drainage issue. These typically point to a clogged filter or kinked drain hose. See our Samsung-specific guide for model-specific troubleshooting.
Bosch: The E24 error code means water isn’t draining. Bosch dishwashers have a triple-filter system that requires regular cleaning. Check out our Bosch-specific guide for detailed instructions.
Whirlpool and KitchenAid: These brands share the same parent company and many components. Troubleshooting is nearly identical for both. The filter is a two-part system (upper filter and lower filter). See our Whirlpool guide for details.
GE: Filter location varies between GE models. Some have a removable cylindrical filter, while others use a flat filter screen. Our GE guide covers the different configurations.
When to Call a Professional
DIY fixes work for most drainage problems. But some issues require professional repair:
- Burned-out pump motor, If the pump makes no sound and the motor has failed, replacement requires disassembling the dishwasher
- Control board problems, Error codes that won’t clear after troubleshooting suggest electronic issues
- Water leaking under the dishwasher, This could indicate a cracked pump housing or failed seal
- Tried everything and it still won’t drain, A technician has diagnostic tools to identify hidden problems
Cost expectations:
| Repair Type | Typical Cost |
|---|---|
| DIY parts (hose, filter) | $10-30 |
| DIY pump replacement | $50-80 |
| Professional service call + repair | $150-300 |
Check this before you decide on a repair for your dishwasher that’s over 10 years old. The AHAM states the average lifespan is 9-12 years, so if yours has hit that mark or nearly reached it, compare costs. An entry-level replacement can range from $400 to $600; often, replacing an outdated unit makes more sense financially than paying for repairs, especially if the pump fails and trips the breaker due to losing prime.
How to Prevent Drainage Problems
Once you’ve fixed your drainage issue, these habits will help prevent future problems:
- Scrape dishes before loading, Remove large food particles. You don’t need to pre-rinse, but scrape solids into the trash.
- Clean the filter monthly, Set a recurring reminder. This single habit prevents most drainage issues.
- Run the garbage disposal first, Clear your disposal before every dishwasher cycle to ensure a clear drain path.
- Use the right amount of detergent, Too much detergent creates excess suds that can interfere with drainage. Follow the package directions. Energy Star recommends using only the amount specified for your water hardness level.
- Run hot water at the sink first, Before starting a cycle, run hot water at your kitchen sink until it’s hot. This ensures your dishwasher starts with hot water for better cleaning and drainage.
FAQ
How do you trigger a dishwasher to drain?
Check if your model has a manual drain function; press Cancel or Drain for 3-5 seconds to stop the cycle and expel leftover water. For certain Whirlpool models, look for a “Drain Only” option on the control panel or review the owner’s manual, typically found mounted in the kitchen drawer.
Can I run the dishwasher if there’s standing water?
No. Running a new cycle with standing water will likely make the problem worse, you’ll end up with even more water that can’t drain. First, remove the standing water manually (towels or wet/dry vacuum), then diagnose and fix the drainage issue before running another cycle.
How much does it cost for a plumber to unclog a dishwasher?
You’ll want to check if your sump pump has lost prime, this typically means it fails to start when the water level rises. A faulty motor is a common culprit, often requiring replacement that can cost $200-400, with parts included. For simpler issues like clearing clogs or replacing a drain hose, a pro service call runs $150-300, covering diagnosis and repair.
Why is my dishwasher holding water in the bottom?
A clogged filter and a blocked drain hose are the two primary issues you’ll face. Begin with cleaning the filter; it resolves many problems. When that fails, inspect your sink’s underside for a kinked or clogged drain hose, details on how to handle these can be found in the troubleshooting guide earlier.
How do I know if my dishwasher drain pump is bad?
Listen during the drain cycle. If you hear a humming sound but water doesn’t drain, the pump motor is trying to run but the impeller may be stuck or damaged. If you hear complete silence when the dishwasher should be draining, the pump motor may have burned out. A multimeter can test for electrical continuity. See our drain pump guide for testing instructions.