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Dishwasher Makes a Loud Buzzing Noise but Still Runs

Updated August 15, 20263 min readTime needed: 15–20 minutes to diagnose
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Short answer: A buzzing sound that continues while the machine still washes and drains normally is usually electrical or vibration-related rather than a jam — most often the drain valve solenoid engaging, a loose panel or bracket vibrating, or the motor working slightly harder than normal. If the machine also fails to wash or drain properly, treat it as a more significant fault rather than just noise.

Because the machine keeps working normally, this is generally a lower-urgency symptom than grinding — but it's still worth a quick check to rule out an easy cause like a loose panel or something rattling in the load.

What you noticeMost likely cause
Buzz only during the drain stageDrain valve solenoid (often normal)
Buzz throughout the whole cycleLoose panel or bracket
Wash and drain performance still normalLower-urgency, likely vibration-related
Cleaning or draining also getting worseTreat as a developing fault, not just noise

Common Symptoms

  • A steady buzzing or electrical-sounding hum during part of the cycle
  • The cycle still completes and dishes still come out reasonably clean
  • The sound may be louder at specific stages, like drain or fill
  • No grinding, crunching, or straining quality to the sound — more of a smooth buzz

Likely Causes

1. Drain valve solenoid engaging

Some machines use an electrically operated valve to control draining, which can produce a brief buzzing sound as it engages — often completely normal if brief and tied to the drain stage specifically.

2. Loose panel or bracket vibrating

An access panel, the kickplate, or an internal bracket that's slightly loose can buzz or rattle in sympathy with normal motor vibration, without indicating any fault with the wash system itself.

3. Motor working slightly harder than normal

A motor nearing the point of needing service can sometimes produce a more noticeable hum or buzz under load, even while still completing its job for now.

4. A loose or vibrating utensil or item in the load

It's worth ruling out first — a lightweight item vibrating against the rack or tub wall can sound surprisingly like an internal electrical buzz.

Safe Checks You Can Do

  • Check the load itself first for anything that could be vibrating against the rack or tub wall.
  • Note exactly which stage of the cycle the buzzing happens during, especially whether it's tied specifically to drain.
  • Check accessible panels (like the kickplate) for looseness, tightening if needed once the machine is unplugged.
  • Confirm the machine is still washing and draining effectively despite the noise, which affects how urgently this needs attention.

Step-by-Step Solution

  1. 1

    Check the load for a vibrating item

    Open the machine partway through (if safe to pause) or after the cycle and check whether anything in the racks could be the source.

  2. 2

    Note the timing within the cycle

    A buzz specifically during drain is more likely the drain valve; a buzz throughout is more likely a panel or motor-related sound.

  3. 3

    Tighten accessible panels

    With the machine unplugged, check and gently tighten the kickplate and any accessible access panels that might be loose.

  4. 4

    Monitor wash and drain performance

    If cleaning and draining remain normal, this is likely a lower-priority noise issue; if either starts to suffer, treat it as a developing fault worth addressing sooner.

What Not to Do

  • Don't ignore a buzzing sound that's also accompanied by reduced cleaning or draining performance — that combination suggests something more than just noise.
  • Don't assume every buzz is the same as a grinding sound — they usually point to different causes and don't need the same response.
  • Don't attempt to access or test the motor or drain valve solenoid's electrical components yourself.

When to Call a Professional

  • The buzzing is accompanied by declining wash or drain performance.
  • Tightening accessible panels doesn't reduce the sound and it isn't tied to a vibrating item in the load.
  • You suspect the motor itself, which is beyond a straightforward homeowner check.

Safety warning

Do not attempt to access, test, or repair the motor or drain valve solenoid's electrical components yourself. If the sound is accompanied by any burning smell, unplug the dishwasher immediately and contact a qualified technician.

Frequently Asked Questions

Is a brief buzz during drain normal?

It can be, on machines that use an electrically operated drain valve — a brief, consistent buzz specifically tied to the drain stage, with normal draining otherwise, is often just that valve operating as designed.

How do I tell this apart from a grinding noise?

Grinding has a mechanical, crunching quality and usually means something is physically caught and being struck. Buzzing is smoother and more electrical or vibration-like. See our grinding noise guide if that description fits better.

Should I be worried if the dishwasher still works fine?

Not urgently, but it's worth keeping an eye on — a persistent new noise that develops over time is often an early sign worth monitoring even when performance hasn't suffered yet.

Home Solutions Editorial Team

Reviewed against manufacturer documentation. Updated August 15, 2026. How we write guides

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