You bet. Here’s the article about fixing a dishwasher that keeps draining.

How to Fix a Dishwasher That Keeps Draining 2026

It’s a weird one, isn’t it? You’ve just finished a cycle, or maybe you haven’t even started one, and you hear that familiar hum… followed by the unmistakable sound of your dishwasher draining. Over and over.

This continuous draining issue isn’t just annoying; it can be a sign of a deeper problem that needs sorting out. It’s not a common dishwasher fault, but when it happens, it’s a real head-scratcher.

Why is your dishwasher suddenly channeling its inner perpetual motion machine, draining away when it shouldn’t? There are a few usual suspects, and thankfully, most of them are DIY-fixable with a bit of patience and the right approach. We’re going to walk through the common causes, from the simplest checks to slightly more involved troubleshooting, so you can get your dishwasher back to its proper, non-draining self.

Understanding How Your Dishwasher Drains (and Why It Stops)

Before we dive into the fixes, it helps to get a basic grip on how your dishwasher is supposed to drain. Normally, it fills with water, washes, rinses, and then, you guessed it, drains that dirty water out. This draining action is controlled by a pump and a check valve.

The pump pushes the water out, and the check valve is supposed to prevent water from flowing back in.

Several things can go wrong with this process, leading to that endless draining. A faulty float switch, a stuck drain valve, a clogged air gap, or even a problem with the main control board can all send your dishwasher into a draining frenzy. Don’t worry, we’ll tackle each of these.

1. The Float Switch: Your Dishwasher’s Water Level Guardian

This is probably the most common culprit when a dishwasher acts like it’s constantly trying to empty itself. The float switch is a simple device that tells your dishwasher when it has enough water and when it needs to drain. Think of it like the ballcock in a toilet tank.

When the water level rises, it pushes a plastic float upwards, which in turn trips a switch. This switch tells the dishwasher to stop filling and, if it’s time, to start draining.

If this float gets stuck in the “up” position (either by gunk or just mechanical failure), your dishwasher will think it’s always full. This can trick the machine into thinking it needs to drain, even when there’s no water in the tub. Conversely, if the float switch is stuck in the “down” position, it might signal that the dishwasher is empty, prompting it to drain if any residual water is detected or if a drain cycle is initiated by the control board for another reason.

How to Check and Fix the Float Switch:

Locate the Float: Dive into your dishwasher’s tub. The float is usually in a corner, often on the bottom. It’s typically a plastic dome or cylinder attached to a stem. You might need to remove the lower rack to get a good look.
Inspect for Obstructions: Is there food debris, a piece of broken plastic, or even a scrub pad stuck around the float? Sometimes, simple gunk is the culprit. Gently pull out any obstructions.
Test the Movement: Push the float up and down. It should move freely and smoothly. If it feels sticky or jammed, try cleaning around its base and stem. A little dish soap and warm water can work wonders.
Check the Switch (if accessible): For a more thorough check, you might need to access the switch itself. This often involves removing the lower access panel of the dishwasher. With the power firmly OFF (unplug the dishwasher or turn off the breaker!), you can usually see where the float stem connects to a small plastic switch. Gently test the switch’s action. If you’re comfortable with a multimeter, you can test for continuity when the float is up and down to ensure it’s signaling correctly, but for most folks, simply confirming free movement and cleaning is enough.
Reassemble and Test: Once you’re sure the float moves freely and is clear of debris, put everything back together and run a short cycle or a rinse cycle to see if the draining issue is resolved. Often, this simple fix is all that’s needed.

2. Clogged Drain Hose or Air Gap

Your dishwasher doesn’t just magically spit water out. It pushes it through a drain hose, which eventually connects to your home’s plumbing, often via a dedicated connection under the sink or through an air gap. If this path is blocked, water can back up, and the dishwasher’s pump might continuously try to push it out, or it might sense the backup and trigger a drain cycle.

The Air Gap: This is a small, usually chrome or plastic, cap on your sink countertop. Its primary job is to prevent dirty sink water from siphoning back into your clean dishwasher water. If this little guy is clogged with food particles or gunk, it can cause drainage problems.

The Drain Hose: This flexible hose runs from the dishwasher pump to the plumbing connection. It can get kinks in it, or it can become clogged with grease and food debris over time.

How to Check and Fix Clogged Drain Hose/Air Gap:

Check the Air Gap First:
- Locate it: It’s usually near your faucet on the sink.
- Remove the Cover: Most air gaps have a decorative cap that screws or pulls off.
- Clean it Out: You’ll see a smaller plastic cap or baffle underneath. Remove that too. You’ll likely find a collection of food debris and grime. Use a small brush, a pipe cleaner, or even just your finger to clean out the internal parts of the air gap. Rinse it thoroughly.
- Run Water: Turn on your sink faucet to ensure water flows freely through the air gap connection.
Check the Drain Hose:
- Access the Hose: This usually means pulling the dishwasher out slightly from under the counter or accessing it from the front or back panel. Remember to disconnect power first!
- Inspect for Kinks: Look for any sharp bends or kinks in the hose. Straighten them out.
- Disconnect and Clean: The drain hose connects to a fitting under your sink (often to the garbage disposal or a separate drain pipe). You’ll likely need a clamp to remove. Once disconnected, try to blow through it to check for blockages. If you suspect a clog, you can try running hot water through it, using a plumber’s snake, or even a strong drain cleaner (follow product instructions carefully). Some people find success by attaching a shop vac to one end and using it to suck out debris.
- Check the Dishwasher Connection: Ensure the connection point on the dishwasher itself isn’t clogged either.
Reconnect and Test: Reconnect the drain hose securely, ensuring no leaks. Put the dishwasher back in place, restore power, and run a test cycle.

3. The Drain Pump or Check Valve Malfunction

The drain pump is what actually pushes the water out of your dishwasher. The check valve is a one-way mechanism that prevents water from flowing back into the dishwasher after it’s been pumped out. If either of these is faulty, it can cause continuous draining.

Faulty Drain Pump: If the pump motor is stuck in the “on” position or is receiving a constant signal to run from the control board, it will keep trying to drain. This might be due to an electrical issue within the pump itself or a continuous command from the control system. You might hear the pump running constantly, even when there’s no water to drain.
Stuck Check Valve: If the check valve gets stuck open, it might not prevent a small amount of residual water from returning, which the dishwasher might then try to drain again. More commonly, a valve stuck in the closed position isn’t the issue for constant draining, but a failed seal allowing water back could, in theory, trigger an attempt to drain again.

How to Check and Fix the Drain Pump/Check Valve:

Access the Components: This is a more involved step. You’ll need to remove the kick plate (lower front panel) or sometimes pull the dishwasher out. Absolutely disconnect power first.
Inspect the Pump: The drain pump is usually located at the bottom of the dishwasher. Look for any obvious damage, loose wires, or blockages directly at the pump’s intake or outlet. Sometimes, debris can get lodged in the pump impeller.
Check the Check Valve: This is often found near the drain pump or where the drain hose connects to the pump. It might be a simple rubber flap or a more complex spring-loaded mechanism. See if it moves freely when you try to push water in one direction but offers resistance in the other. If it looks damaged or stuck, it will need replacement.
Electrical Checks (Advanced): If you’re comfortable with electrical testing, you can use a multimeter to check if the pump is receiving continuous power when it shouldn’t be. This would point towards an issue with the control board or wiring.
Replacement: If the pump or check valve is clearly faulty, they will need to be replaced. This is a part that you can usually order online based on your dishwasher’s make and model. Follow the manufacturer’s instructions or online guides for disassembling and replacing these parts.

4. The Main Control Board or Water Level Sensor Issue

This is generally the last resort, as it’s the most expensive and complex fix. The main control board is the dishwasher’s brain, telling all the components what to do and when. The water level sensor (sometimes integrated with the float switch or a separate pressure sensor) tells the board how much water is in the tub.

If the control board has a glitch or a component fails, it could potentially send a constant signal to the drain pump. Similarly, if the water level sensor is faulty and incorrectly reporting that the dishwasher is full (or has too much water), it could trigger an endless drain cycle.

Identifying Control Board/Sensor Problems:

No Other Obvious Fixes: If you’ve meticulously checked the float switch, drain hose, air gap, and drain pump, and the problem persists, the control board or a sensor is a strong possibility.
Erratic Behavior: Sometimes, a faulty control board exhibits other strange behavior, like lights flickering, cycles not starting correctly, or random error codes.
Professional Diagnosis: Diagnosing a faulty control board or sensor often requires specialized knowledge and diagnostic tools. Unless you have experience with appliance electronics, this is usually a job for a qualified appliance repair technician. They can test the sensor outputs and check for proper signals from the control board.

What to Do:

Consult Your Manual: Your dishwasher manual might list error codes that can help pinpoint a sensor or control board issue.
Contact a Professional: If you suspect the control board is the problem, it’s often more cost-effective to have a technician diagnose and replace it, or in some cases, to consider replacing the appliance if the repair cost is too high.

Other Considerations: What Else Could Be Happening?

Incorrect Installation: In rare cases, if the dishwasher was recently installed or reinstalled, improper plumbing connections or a problematic drain loop could be the cause. Ensure the drain hose has a high loop (an anti-siphon loop) to prevent water from flowing back by gravity.
Dishwasher Not Fully Draining in the First Place: I know we’re talking about keeps draining, but sometimes the issue is that it’s not draining properly to begin with (clogged pump filter, etc.), and the machine is programmed to re-attempt drainage. So, double-check that it is completely emptying between drain cycles.

A Step-by-Step Troubleshooting Approach

When your dishwasher drains incessantly, don’t panic. Work through the most common and easiest fixes first.

Power Cycle: The simplest fix for any electronic device, unplug your dishwasher (or flip the breaker) for a few minutes, then plug it back in. This can sometimes reset the control board if it’s just a minor glitch.
Check the Float Switch: Clean it, ensure it moves freely. This is your most likely suspect.
Inspect the Air Gap and Drain Hose: Clear any blockages and straighten kinks.
Examine the Drain Pump and Check Valve: Look for visible issues.
Consider Professional Help: If none of the above resolve the issue, it’s time to call in an expert to check the control board or sensors.

Keeping Your Dishwasher Happy: Preventative Maintenance

To avoid this endless draining headache in the future, a little preventative maintenance goes a long way:

Scrape Plates: Always scrape off large food particles before loading. Your dishwasher isn’t a garbage disposal.
Clean the Filter: Most dishwashers have a filter at the bottom of the tub. Clean this regularly (monthly is a good habit). A clogged filter can impede drainage.
Run Hot Water: Run hot water in your sink (especially near the drain connection) before starting a dishwasher cycle. This helps flush out grease that might clog the drain hose.
Use a Dishwasher Cleaner: Periodically run a dishwasher cleaning product through an empty cycle. This helps break down grease and gunk that builds up inside the machine and the drain system.

Dealing with a dishwasher that won’t stop draining can be frustrating, but by systematically working through these troubleshooting steps, you can often identify and fix the problem yourself and get your appliance back to its quiet, efficient self. That sound of water draining should only happen when you tell it to!

Adnan

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