Food Waste Disposer Unusual Noises

If your food waste disposer is making unusual noises, the problem could be caused by a foreign object in the grinding chamber, worn bearings, loose mounting components, or a failing motor. Before replacing any parts, inspect the most common causes listed below.

Safety Notice: Always turn off power to the disposer before servicing it. Never place your hand inside the grinding chamber. Use tongs or pliers to remove any foreign objects.

Possible Causes

  • Foreign object in the grinding chamber
  • Loose grinding impellers
  • Worn motor bearings
  • Loose mounting assembly
  • Damaged grinding plate
  • Loose discharge tube
  • Loose plumbing or mounting hardware
  • Failing motor

1. Foreign Object in the Grinding Chamber

Most Common Solution

Silverware, bottle caps, bones, glass, and other hard objects can become trapped inside the grinding chamber, creating loud rattling or grinding noises during operation.

What to do:

  • Turn off power to the disposer.
  • Use tongs or pliers to remove the foreign object.
  • Rotate the grinding plate manually to ensure it moves freely.
  • Restore power and test the disposer.

2. Grinding Impellers

Loose or worn grinding impellers can create rattling or clicking noises while the disposer is operating.

What to do:

  • Disconnect power.
  • Inspect the impellers for excessive wear or damage.
  • Remove any debris preventing proper movement.
  • Replace damaged components if applicable.

3. Motor Bearings

Worn motor bearings often produce a grinding, squealing, or rumbling noise that becomes louder over time.

What to do:

  • Listen for noise coming directly from the motor.
  • Check whether the grinding plate rotates smoothly.
  • Replace the motor or disposer assembly if the bearings have failed.

4. Mounting Assembly

A loose sink mounting assembly can allow the disposer to vibrate and produce excessive noise.

What to do:

  • Inspect the mounting ring beneath the sink.
  • Tighten any loose mounting components.
  • Verify the disposer is securely attached.

5. Grinding Plate

A damaged or bent grinding plate can create scraping or knocking noises during operation.

What to do:

  • Disconnect power.
  • Inspect the grinding plate for visible damage.
  • Replace the disposer if the grinding mechanism is damaged.

6. Discharge Tube

A loose discharge tube may vibrate against the cabinet or plumbing while the disposer is running.

What to do:

  • Inspect the discharge tube mounting screws.
  • Tighten any loose connections.
  • Replace damaged gaskets if necessary.

7. Plumbing or Mounting Hardware

Loose drain pipes, mounting screws, or nearby plumbing components can create vibration and rattling noises.

What to do:

  • Inspect all accessible plumbing connections and mounting hardware.

  • Tighten loose screws, clamps, and fittings.

  • Verify the noise has been eliminated.

8. Motor

A failing motor can produce humming, grinding, or loud mechanical noises before it eventually stops working.

What to do:

  • Confirm there are no foreign objects or loose components.
  • If the noise originates inside the motor, replace the motor or disposer assembly.

Need Help Finding the Correct Part?

If you need help identifying the correct replacement part, send us your complete food waste disposer model number and a clear photo of the appliance identification label before placing your order. Our team will verify compatibility and help ensure you receive the correct replacement part the first time.