Dishwasher Making Noises – Normal Sounds and Signs of a Problem

Issue

Your dishwasher makes noises during operation, and you are unsure whether the sounds are normal or indicate a fault.

Dishwashers produce various sounds during different stages of a wash programme. Many noises are a normal part of filling, washing, draining, and drying. However, unusually loud, repetitive, or abnormal sounds may indicate a problem that requires attention.

Typical signs include:

• Clicking, humming, or buzzing sounds
• Water spraying inside the appliance
• Pump noises during draining
• Dishes rattling against each other
• Grinding, knocking, or excessive vibration

Applies to

• Dishwashers

Resolution

Start by identifying when the noise occurs during the programme. In many cases, the sound is part of normal operation and does not require service.

1. Check if the noise occurs while the dishwasher is filling with water

A humming or buzzing sound when the programme starts is normally caused by the inlet valve opening and water entering the appliance.

This is normal operation.

2. Listen for water spraying inside the dishwasher

Swishing, splashing, or spraying sounds are typically created by the spray arms distributing water around the tub.

The intensity of these sounds may vary depending on the load and selected programme.

This is normal operation.

3. Check for dishes, cutlery, or cookware touching each other

Plates, glasses, pans, or cutlery may move slightly during washing and create rattling or tapping noises.

• Ensure items are loaded securely.
• Avoid placing lightweight items where they can move freely.
• Check that long utensils do not interfere with the spray arms.

4. Identify noises during the draining phase

A humming or pumping sound near the end of the wash or rinse cycle is usually the drain pump removing water from the appliance.

This is normal operation.

5. Check for spray arm contact

If you hear a repeated clicking or knocking sound, the spray arms may be hitting:

• Large plates
• Baking trays
• Long utensils
• Items protruding from the baskets

Rotate the spray arms by hand and ensure they move freely.

6. Check for loose or foreign objects inside the dishwasher

Small objects may become trapped inside the appliance filter and pump and create abnormal noises during operation.

Examples include:

• Glass fragments
• Fruit stones
• Broken crockery pieces
• Labels
• Food debris
• Plastic packaging fragments

These objects can cause:

• Grinding noises
• Rattling sounds
• Clicking during washing or draining

Clean the filters and inspect the sump area for foreign objects if abnormal noises occur.

Note: Wear protective gloves when inspecting the sump area.

7. Check whether the dishwasher is level

An appliance that is not level may vibrate against surrounding cabinets or the floor.

• Verify that all feet are adjusted correctly.
• Ensure the dishwasher is securely installed.

8. Look for signs of an abnormal noise

The following sounds are not typically considered normal:

• Loud grinding noises
• Metal-on-metal scraping sounds
• Continuous knocking not caused by the spray arms
• Excessive vibration that was not previously present
• Unusual noises accompanied by poor washing performance or error messages

If these symptoms occur, further inspection or service may be required.

When Is It a Genuine Fault?

The noise may indicate a fault if:

• The sound is significantly louder than normal.
• New noises appear suddenly.
• Grinding, scraping, or mechanical knocking continues throughout the programme.
• The dishwasher displays an error code.
• Washing, drying, filling, or draining performance is affected.

In these cases, there may be a fault with the circulation pump, drain pump, spray arm assembly, motor bearings, impeller, or electronic control system. A technical inspection may be required to identify the root cause.

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Cause

Dishwasher noises are typically generated by normal mechanical and hydraulic operations, including:

• Water filling through the inlet valve
• Water circulation through the spray arms
• Drain pump operation
• Dishes and cookware moving slightly during washing

Less commonly, unusual noises can be caused by:

• Obstructions in the spray arms
• Incorrect loading
• Installation issues
• Worn pump or motor components
• Foreign objects inside the filter or pump area

FAQ

Is it normal to hear water spraying inside the dishwasher?

Yes. Spray-arm operation creates splashing and spraying sounds during washing.

Why does my dishwasher make a humming noise?

A humming sound is often produced by the water inlet valve, circulation system, or drain pump during normal operation.

Why do I hear a knocking sound?

The spray arm may be touching dishes, cookware, or utensils inside the appliance.

Is vibration normal?

A small amount of vibration is normal. Excessive vibration should be investigated.

Why does the dishwasher sound different on the Eco programme?

Different programmes use varying water levels, temperatures, and pump speeds, which can change the sound profile.

When should I contact service?

Contact service if you hear grinding, scraping, persistent loud knocking, or if the noise is accompanied by poor appliance performance or error messages.