How to solve a dishwasher making loud or strange noises?

 

Identify the source of the noise

 

Before addressing the noise issue, it's essential to first identify the source as dishwashers can make various types of noises for different reasons. Begin by running your dishwasher through a cycle and actively listening. Pay attention to whether the noise occurs periodically or persistently, at which part of the cycle it begins (e.g., filling, washing, draining, drying), and what type of noise you're hearing—such as grinding, humming, knocking or screeching. Carefully understanding and pinpointing the exact timing and nature of the noise substantially aids in the troubleshooting process.

 

Inspect and clean the spray arms

 

One common cause of strange dishwasher noises can be debris or foreign objects entering or obstructing the dishwasher spray arms:

• Turn off your dishwasher and unplug it to ensure safety before proceeding.
• Carefully remove the upper and lower spray arms; detailed instructions can be typically found in your instruction manual.
• Inspect each arm closely for any obstructions such as small pieces of glass, food particles, plastic or other debris.
• Using a toothpick, thin metal rod, or small brush to carefully remove any blockages found in the holes. Then rinse thoroughly in warm water.
• Reinstall the spray arms securely, ensuring that they rotate freely after replacing.

 

Check dishwasher racks and dishes placement

 

Sometimes noises come from dishes or utensils moving against each other or the racks due to improper positioning during the wash cycle:

• Arrange dishes and utensils so that they are securely placed in the dishwasher rack. Make sure they're not touching or rattling against each other or against the racks.
• Verify that large dishes or pans do not prevent the rotation of spray arms, as obstructions can cause knocking sounds.
• Ensure the racks themselves are correctly positioned on their tracks and are fully snapped and secured into place.

 

Set dishwasher level

 

An uneven dishwasher can cause unusual vibrations resulting in loud or rattling noises. Check the dishwasher itself to ensure it's properly level:

• Using a carpenter’s level, verify that the dishwasher is leveled evenly from side-to-side and front-to-back.
• If the unit is tilted or unbalanced, adjust the leveling legs at the bottom of the dishwasher until it is steady and level.
• Ensure the dishwasher is also firmly installed and securely mounted under the countertop or cabinetry within your kitchen.

 

Examine and clean dishwasher filter system

 

Many dishwashers have filters that trap food remnants and dirt. When the filter system is dirty or clogged, it may lead to a buzzing or grinding noise:

• Consult your dishwasher owner's manual to locate and safely remove the filter.
• Carefully inspect the removed filter for food particles, broken glass, debris, or other foreign objects.
• Thoroughly wash the filter under warm running water and gently scrub away stubborn grime or debris using a soft brush or sponge.
• Once cleaned, reinstall the filter securely and carefully—giving special attention to proper fit to avoid potential leaks or operational issues.

 

Evaluate dishwasher pump and motor

 

Dishwasher pump and motor problems may cause louder humming, buzzing, grinding or squealing noises. Accessing these parts will require removal of the bottom cover panel, allowing you to carefully inspect for damage or obstructions:

• Disconnect power supply before handling dishwasher internals.
• Check for visible obstructions or debris inside the pump housing and motor housing.
• If pump and motor components appear compromised, damaged or unusually worn, consider contacting a professional to safely inspect and replace these components.

Do note that inspecting dishwasher pumps or motors is more complex and often requires professional assistance due to safety considerations and technical requirements.

 

Inspect inlet valve and water lines

 

Water inlets and valves may develop loud noises, knocking, humming, or buzzing when improperly functioning or partially blocked:

• Turn off power and water supply to the dishwasher before performing checks.
• Inspect inlet water valves, hoses, and connections for any leaks, corrosion, or visible wear.
• Assess valve screens or filters within the inlet valve for clogs or debris.
• If you do observe significant wear, leaks, or damage, consider replacing inlet valves or hoses entirely.

Inlet valve or water line issues might impose risks of leaks and water damages, hence professional replacement of these parts may be advisable.

 

Seek professional help when necessary

 

If troubleshooting these common dishwasher fixes does not resolve your issue or discomfort remains about conducting these inspections and repairs yourself, consider calling a professional technician. For example, homeowners located in St. Louis and those residing in Nashville enjoy convenient access to reliable appliance repair specialists who can effectively diagnose and resolve dishwasher issues promptly.

Professional technicians possess the necessary experience, training, and equipment to safely and efficiently correct complicated mechanical problems, which typically result in restored dishwasher function and quiet operation.