A dishwasher that won’t drain can be a frustrating issue, but it’s often a problem that can be resolved with a few simple steps. Before calling a professional, it’s worth checking common causes like clogs, blockages, or issues with the drain hose. By troubleshooting the problem yourself, you may save both time and money while restoring your dishwasher to full functionality.
Opening your dishwasher expecting sparkling clean dishes, only to find a pool of murky, standing water at the bottom, is a frustrating experience. This common household problem can bring your kitchen routine to a halt, but it doesn’t always mean a costly call to a repair service. In many cases, the cause is a simple clog or blockage that you can clear yourself with a few basic tools and a little bit of time. This guide is designed for beginners and will walk you through the most common culprits. We’ll provide clear, easy-to-follow instructions on how to fix a dishwasher not draining and restore your appliance to perfect working order.
Clogs and Blockages
Clogs and blockages are one of the most common causes of a dishwasher not draining. These can occur in various parts of your dishwasher, including the filter, drain hose, and garbage disposal (if connected). Food particles, grease, and other debris can build up over time and obstruct the flow of water, causing your dishwasher to not drain properly.
To fix this issue, start by checking and cleaning out any visible clogs in the filter or drain hose. You can use a toothbrush or small brush to remove any debris that may be stuck. If you have a garbage disposal, make sure it is also clear and running smoothly. Running hot water through it can help break down any build-up.
If these steps do not solve the problem, you may need to remove and clean out the drain pump itself. This should be done carefully as there may be sharp objects inside (such as broken glass). Refer to your dishwasher’s manual for specific instructions on how to
Step-by-Step Guide on How to Fix a Dishwasher Not Draining
Step 1: Turn Off Power to the Dishwasher
Before you begin any diagnostic or repair work, your absolute first step must be to ensure your safety. Water and electricity are a dangerous combination, so you must completely disconnect the dishwasher from its power source. Go to your home’s main electrical panel and find the circuit breaker that controls the dishwasher. Flip the breaker to the “Off” position. If your dishwasher is plugged into an outlet under the sink, simply unplug it. This crucial safety measure prevents any risk of electric shock while you work on the appliance’s internal components.
Step 2: Clear and Clean the Dishwasher Filter
The most frequent cause of a draining issue is a clogged filter. The filter is designed to catch large food particles and debris to prevent them from clogging the drain pump. Over time, it can become completely blocked. To clean it, first remove the bottom dish rack to get clear access. The filter is usually a cylindrical component that you can twist and lift out. You may also see a flat mesh screen. Take these parts to your sink and wash them thoroughly with warm, soapy water and a soft brush. Reinstall the clean filter before moving on.
Step 3: Check the Drain Hose
The drain hose is the corrugated plastic tube that runs from your dishwasher to the sink’s plumbing or garbage disposal. This hose can easily become kinked or clogged. First, visually inspect the hose’s entire length to ensure it isn’t sharply bent or crushed behind the dishwasher, which would restrict water flow. If it looks fine, the clog may be inside. Place a shallow pan under the connection point, then disconnect the hose from the garbage disposal or sink drain. Allow any trapped water to empty into the pan. This step is a primary check in learning how to fix dishwasher not draining.
Step 4: Clear Any Blockages from the Drain Hose
With the drain hose disconnected, you can check it for an internal blockage. First, try blowing through the hose to see if air can pass freely. If you feel significant resistance, there is likely a clog inside. You can often dislodge it using a wire coat hanger that you’ve straightened out, or a plumber’s snake. Carefully feed the wire into the hose and gently move it back and forth to break up the debris. Once you believe it is clear, you can also flush it out with a garden hose outside to ensure all obstructions are removed.
Step 5: Inspect the Garbage Disposal Connection
If your dishwasher drains into a garbage disposal, this is another common trouble spot. Many new garbage disposals are manufactured with a plastic plug inside the dishwasher inlet nozzle to seal it off for homes that don’t have a dishwasher. If you recently installed a new disposal, it’s possible this plug was never removed. After disconnecting the drain hose, you can feel inside the inlet nozzle on the disposal with your finger or a screwdriver to check if the plug is still in place. If it is, you’ll need to knock it out with a hammer and screwdriver.
Step 6: Clean the Air Gap
Some plumbing codes require an air gap, which is a small chrome cylinder located on your countertop near the sink. Its job is to prevent contaminated sink water from siphoning back into your dishwasher. This small device can easily become clogged with food debris. To clean it, simply twist off the chrome cover. You will see a smaller plastic cap underneath. Pull that cap off and use a small brush or a paperclip to clear out any gunk or debris that has accumulated inside. This simple cleaning can often resolve the draining issue immediately.
Step 7: Check the Drain Pump
If you’ve cleared the filter, hose, and air gap without success, the issue may lie with the drain pump itself. The pump’s job is to force water out through the drain hose. Its impeller can sometimes be blocked by a small, hard object like a piece of glass, a bone, or a fruit pit. You will need to access the pump, which is usually located beneath the filter at the bottom of the dishwasher tub. After removing any standing water, you may be able to reach in and check if the impeller can spin freely. If it’s stuck, carefully remove the obstruction.
Step 8: Test the Drain Pump Motor
If the pump’s impeller is clear but the dishwasher still won’t drain, the pump motor may have failed. This is a more advanced repair that may require a multimeter to test for electrical continuity. If you are comfortable with this, you can disconnect the wires to the pump motor and test it. If the multimeter shows no continuity, the motor is likely burned out and the entire drain pump assembly will need to be replaced. At this stage, many homeowners choose to call a professional appliance repair technician, as it involves a more complex part replacement.
Frequently Asked Questions
Why Is There Standing Water in the Bottom of My Dishwasher?
A small amount of clean water (a cup or two) in the bottom is normal for many models, as it helps keep seals moist. However, a significant pool of dirty water indicates a drainage problem. The most common causes are:
- A clogged filter at the bottom of the tub.
- A kinked or blocked drain hose.
- A blockage in the air gap or garbage disposal connection.
How Do I Manually Drain a Dishwasher?
To manually remove standing water, start by turning off the power. Use a cup or small container to bail out as much water as possible into a bucket. For the remaining water in the sump, use towels or a large sponge to soak it up. Getting the dishwasher as dry as possible is important before you start working on internal components like the filter or drain pump.
Is It Safe to Use a Chemical Drain Cleaner in My Dishwasher?
No, you should never use harsh chemical drain cleaners like Drano in your dishwasher. These caustic chemicals can severely damage the plastic and rubber components of the dishwasher, including hoses, seals, and the drain pump itself. This can lead to leaks and much more expensive repairs. Stick to manual methods of clearing clogs.
Can a Clogged Garbage Disposal Stop a Dishwasher From Draining?
Yes, absolutely. If your dishwasher’s drain hose connects to your garbage disposal, a clog in the disposal unit itself can prevent water from draining properly. Before checking the dishwasher, try running your garbage disposal with plenty of cold water to see if you can clear the main sink drain. This simple step can sometimes solve the entire problem.
When Should I Call a Professional for a Draining Issue?
You should call a professional if you have worked through all the basic troubleshooting steps—cleaning the filter, checking the hose, and clearing the air gap—and the problem persists. If you suspect the issue is electrical, such as a failed drain pump motor or a faulty control board, it is safest to have a qualified appliance repair technician diagnose and fix the problem.
Conclusion
A dishwasher that refuses to drain is a nuisance, but it’s often a problem you can solve without professional help. By methodically checking the most common trouble spots, starting with the simple filter cleanout and moving on to the drain hose and its connections, you can often locate and resolve the blockage yourself. Taking the time to understand these components not only saves you money but also empowers you as a homeowner. Now that you have a comprehensive guide on how to fix dishwasher not draining, you can tackle that standing water with confidence and get your kitchen back to running smoothly.
