Is your dishwasher making noise when off? The sound of water sloshing or a motor humming when your dishwasher is off can be annoying and concerning. Not knowing why your appliance is making noise can be a major pain point for homeowners. I’ve experienced it myself and understand the frustration.
The most common cause for this problem is an activated anti-flood device. This safety feature is designed to detect and remove excess water in the washing machine tub. It works independently to turn on the drain pump motor even if the dishwasher is not in active use. So the appliance ends up in an endless drain cycle, where it doesn’t fill or circulate water as usual.
In this article, I’ll highlight the most common reasons why your dishwasher is making noise when off. I’ll also provide some troubleshooting tips to help you diagnose the issue. I promise to explain what’s causing the racket and how to stop your dishwasher from disrupting your peace and quiet.
What Is an Anti-Flood Device?
An anti-flood device is a safety component that prevents dishwasher overflow. This mechanism clears out excess water from the appliance sump and shuts off the water-fill valve.
The anti-flood protector may use a simple float switch or a more high-tech pressure-activated system. Either way, its function is to pump out extra water from the tub while cutting off the water supply.
By removing residual water and disabling filling, the anti-flood device stops overflow before it starts. It keeps your kitchen dry by regulating internal water levels in the dishwasher. This important safety feature is useful but can cause noise if it gets stuck or activated.
How Does the Anti-Flood Device Remain Activated All the Time?
The anti-flood device can get stuck in the “on” position for a few different reasons.
Often, a leaky valve is to blame. This allows water to continuously drip into the dishwasher, repeatedly triggering the anti-flood protector. The faulty valve provides a constant influx of water that keeps the safety mechanism activated.
An obstructed one-way valve can also be the reason why your dishwasher is making noise when off. Debris blocking the valve allows water to flow backward into the dishwasher, overriding the anti-flood device’s offsetting.
Finally, an improperly installed drain line is another culprit. If positioned at an incline, the drain hose can let wastewater back into the tub. The anti-flood feature has to continuously pump it out, remaining in a constant cycle.
What Are the Other Causes of Dishwashers Making Noise When They Are Off?
If your dishwasher makes noise even when it’s turned off, several issues might be responsible. Here’s a detailed look at these potential causes:
- Clogged Drain: A clogged drain can lead to water build-up inside the dishwasher, causing noise as the appliance struggles to manage the excess water. Regular cleaning of the drain and filters can prevent this issue.
- Loose Drain Hose: If the drain hose is not securely attached, it might move around and create a thumping noise. Securing the hose with cable ties or clips can help resolve this problem.
- Faulty Water Inlet Valve: A malfunctioning water inlet valve can produce a buzzing or humming noise. This valve controls water flow into the dishwasher, and if defective, it may not close properly, allowing water to enter even when the appliance is off.
- Circulation Pump Issues: The circulation pump, which moves water through the dishwasher, might have worn bearings or other mechanical issues causing noise. If the pump is faulty, it can create a continuous humming or buzzing sound even when the dishwasher is idle.
- Impeller Problems: The impeller aids in water movement and drainage. If it becomes blocked or damaged, it can lead to noise. Debris caught in the impeller can cause grinding or humming sounds.
- Water Hammer: Water hammer is a plumbing issue that causes a loud banging noise when water flow is suddenly stopped or started. This can occur even when the dishwasher is off if there are fluctuations in water pressure within the plumbing system.
How Can You Fix the Noise Coming From the Dishwasher When It’s Off?
To address the issues causing your dishwasher to make noise when it’s powered off, follow these solutions for each potential problem:
Fix the Anti-Flood Switch
- First, remove the kickplate at the bottom front of the dishwasher. This panel is held on by screws that you’ll need to unscrew with a screwdriver. Once the kickplate is off, you’ll have access to the bottom reservoir.
- Use a towel or sponge to soak up any water pooled in the bottom of the dishwasher. With the reservoir empty, the anti-flood switch should be able to move back into the off position.
- Reattach the kickplate once finished. This should allow the anti-flood device to reset to its normal operation. The constant draining noise when the dishwasher is off should now cease.
Clogged Drain:
- Inspect and Clean the Filter: Remove the filter from the bottom of the dishwasher. Clean it thoroughly with hot, soapy water to eliminate food particles or debris. Regular cleaning prevents clogging, ensuring smooth water flow.
- Use a Baking Soda and Vinegar Solution: Pour equal parts of baking soda and vinegar into the dishwasher’s drain, letting it sit for 20 minutes. Follow this with boiling water to help clear any remaining clogs. This natural solution can effectively dissolve buildup.
Tighten the Drain Hose:
- Secure the Hose: Ensure the drain hose is securely connected to the sink or garbage disposal. Use cable ties or clamps to prevent movement. Properly securing the hose minimizes noise caused by vibrations.
- Check for Kinks: Look for kinks in the hose that could restrict water flow. Straighten any kinks and align the hose correctly. This will improve water drainage and reduce noise.
Check the Water Inlet Valve:
- Inspect and Replace if Necessary: Examine the water inlet valve for signs of wear or malfunction. If it’s faulty, replacing it is necessary to prevent unwanted water flow into the dishwasher when it’s off. This replacement ensures proper water control.
Fix Circulation Pump Issues:
- Check for Debris: Inspect the circulation pump for debris or blockages causing noise. Clean any obstructions to ensure the pump works smoothly. This step is crucial for maintaining efficient water movement.
- Replace Worn Components: If the pump has worn bearings or other issues, consider replacing the faulty parts. Restoring these components will return the pump to normal operation.
Check the Impeller:
- Clear Blockages: Remove any debris caught in the impeller that might cause noise. Ensure the impeller can move freely without obstruction. This is vital for effective water circulation and drainage.
- Replace Damaged Parts: If the impeller is damaged, replacing it ensures proper water movement and drainage, reducing noise significantly.
If the noise persists after draining the reservoir, the issue may require a visit from an appliance repair technician. They can diagnose and replace any faulty parts like leaky valves or malfunctioning switches.
For older dishwashers that have had chronic drainage issues, replacement may be the most cost-effective option. Newer models often feature quieter and more reliable operation.
What Are the Common Noises That Your Dishwasher Can Make When It’s Turned Off?
Here are some common noises your dishwasher can make while being turned off:
Beeping noise
The beeping starts when the door is opened during an active wash or rinse cycle. Sensors detect when air and steam escape upon opening. The dishwasher then triggers the beeping to notify you to close the door.
To stop the beeping noise, simply shut the dishwasher door completely. Press start so the appliance can pick up where it left off in the cycle. The beeping will discontinue once the sensors detect the closed door and resume operation. Just be patient for the beeping to stop on its own.
Booming sound
A loud booming or hammering noise coming from your dishwasher is likely caused by a water hammer. This occurs when there are issues with your household plumbing that cause pipes to vibrate.
Specifically, the booming noise happens when the dishwasher’s water valve closes suddenly. The force of the water pressure causes the pipes to rattle violently as the water flow stops. You may notice similar vibrating pipes when quickly turning off faucets.
The water hammer effect stems from worn washers, improper valve closure, or high water pressure. Running toilets or draining sinks can also set it off as pipes shudder.
To stop the booming dishwasher noise, consulting a plumber to inspect your pipes and water pressure is advised. They can make repairs so water is properly regulated and doesn’t cause booming. Adjusting your water pressure regulator may also help.
Thumping sound
The spray arms circle around to water and clean the dishes. If something is obstructing their path, the spray arms make contact, causing a rhythmic thudding noise. The sound occurs in time with the spray arm’s rotation.
To resolve it, rearrange how dishes and utensils are loaded. Make sure tall items like pots don’t block the spray arms’ rotation. Provide clear space for the arms to revolve unimpeded. You may need to adjust the top rack height as well.
Rattling noise
Lightweight items like plastic containers are especially prone to shifting around in the racks from the water action. If they come dislodged, they will rattle around, colliding with other dishes. Improperly spaced plates and bowls can also bang into each other, causing rattling noises.
To confirm the rattling is from dishes, run the dishwasher empty. If the noises stop, it confirms the problem is from loading. Consult your owner’s manual on the proper way to load dishes to prevent rattling. Secure light items on bottom racks. Space plates apart and position face down. Adjust upper racks to prevent dishes from vibrating against spray arms.
Squealing sound
A high-pitched squealing or screeching noise may come from your dishwasher because the pump seal runs dry. When first installed or unused for a while, the dishwasher doesn’t contain the small amount of residual water needed to lubricate the pump parts. Friction from the dry components causes the screeching.
You may need to do the manual water addition after long breaks of not running the dishwasher. It essentially primes the pump and prevents the annoying screeching sound during operation. Just be sure to add water to the tub bottom, not the detergent compartment.
Grinding noise
The grinding happens when the dishwasher’s basin is empty, but the circulation pump still tries to operate. Without water to create hydraulic circulation, the pump components rub against each other. This metal on metal causes the grinding sound during the cycle.
The issue usually occurs from a malfunctioning float switch or water inlet valve. The float should tell the dishwasher it’s empty and not trigger the pump. A bad inlet valve may fail to fill the machine with water before the cycle commences.
To resolve the grinding issue, the malfunctioning parts like the inlet valve or float switch need to be replaced.
Humming noise
The motor powers the circulation pump to spray water for washing and rinsing dishes. You’ll hear a low, even humming sound from motor activation and vibration throughout the cycle. This loud humming noise continues as the pump draws in water and moves it through the spray arms.
Some dishwashers also have a chopper or grinder built into the pump assembly. It processes small food particles in the water. This component creates a humming noise when shredding debris.
If you are still confused, watch the below video:
What Should I Do If the Issue Persists?
If troubleshooting doesn’t resolve the issue, it’s time to bring in a professional appliance repair technician. There are a few things to look for when hiring a contractor:
- Proper licensing – Make sure any technician is licensed in your state, which ensures proper training and expertise.
- Experience – Look for contractors with several years or more of handling dishwasher repairs specifically. Their skills will be invaluable for diagnosing and fixing the problem.
- Fair pricing – Avoid overpriced technicians but also be wary of quotes that seem too low. Look for reasonable rates backed by quality service.
- Warranties – Hire contractors who guarantee their labor and parts for at least a short term in case issues recur.
- Insurance – Only hire insured technicians to avoid liability if damages or injuries happen in your home.
Vetting contractors thoroughly on these criteria helps find the right pro to permanently resolve stubborn drainage problems and noise issues. They’ll have the proper expertise to replace faulty parts or indicate if full replacement is needed.
What Are the Preventive Measures to Avoid the Noises Coming From the Dishwasher?
Regular maintenance and prompt repairs are key to preventing noisy issues with your dishwasher. Here are some tips:
- Schedule annual appliance inspections to catch problems early. A technician can examine parts like valves and hoses for leaks before they worsen.
- Don’t ignore small issues. Address any unusual noises right away before they escalate. Even minor leaks and drips should be repaired.
- Replace worn or damaged parts like spray arms and tub seals. These components wear out over time and can start rattling or cause water issues.
- Inspect and clean around the bottom filter regularly to ensure no debris clogs drainage. Clogs can lead to water retention issues.
- Ensure proper installation of drain lines, pumps, and valves. Correct positioning avoids abnormal water flow.
- Use a water softener if you have hard water. The minerals in hard water can cause scale buildup on dishwasher parts and restrict water flow.
Routine care and fixing problems at the first sign of noise keep your dishwasher running smoothly and quietly. Don’t tolerate minor issues – repair them before major repairs become necessary.
Infographic: Top Causes of Dishwasher Making Noise When Off
Frequently Asked Questions
Why is my dishwasher buzzing at the end of the cycle?
A buzzing sound as the cycle finishes is normal. It’s the dishwasher draining water. But a loud buzzing noise may mean a blocked pump impeller, so inspect and remove obstructions.
Why is my dishwasher making a low humming sound?
Humming is the dishwasher motor and its cooling fan rotating, along with the food disposal grinding particles. It’s expected noise.
How do I stop my dishwasher from making noise?
Stop noise by removing the pump cover, gripping, and pulling up until it resists. Check for debris clogging the pump, then replace the cover properly.
Why does my dishwasher sound like it’s running but it’s not?
Humming but no water fill means the inlet valve or float switch is likely faulty. A flood-safe inlet hose could also prevent water from entering.
Conclusion
When your dishwasher keeps making noise even after it’s turned off, it’s annoying. But the good news is, the cause is usually not too hard to fix. The key is working out what’s making the racket.
As we talked about, it’s most often the drain pump that stays on. Problems with the anti-flood protector, like stuck valves or water flowing backward, make the pump run non-stop. Following some tips, like checking hoses and emptying excess water, can solve lots of issues.
This was all about this issue. If you have something on your mind, feel free to comment below. I would love to help you out.
