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Buva malfunction

Buva ventilation unit humming

Is your Buva ventilation unit or HRV unit humming? A humming sound is often caused by worn bearings, a heavy-running motor, contamination, or resonance of the ventilation unit or ductwork.

Problem Humming sound
  • Constant hum
  • Vibrations or resonance
  • Motor overhaul often possible
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What do you notice?

  • A low hum from the ventilation unit.
  • The humming worsens at a higher ventilation setting.
  • Vibrations through walls, ceiling, or ventilation ducts.
  • The motor is still running but sounds heavier than normal.

Possible causes

  • Worn bearings.
  • Imbalance of fan or motor.
  • Contamination of fan wheel or motor.
  • Resonance of the ventilation unit or ductwork.

What can you check yourself?

Check whether the humming comes from the motor itself or is amplified via the housing or ventilation ducts. Also, pay attention to whether the sound changes when you select a different ventilation setting. Always disconnect the ventilation unit from power before opening it.

Not sure where the humming is coming from?

Use our troubleshooter to determine step-by-step what is causing your Buva ventilation unit to hum and what the appropriate solution is.

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When is overhaul possible?

Is the humming caused by wear to the motor or bearings? Then an overhaul is often an excellent solution. This can ensure your Buva ventilation system functions quietly and reliably for years to come.

Choose the right solution

Buva motor overhaul View repairs → More about Buva overhaul View overhaul page →

Read more about Buva

Also view our other information pages about Buva ventilation units, HRV units, parts, malfunctions, and overhaul.

Buva ventilation units Main page of the Buva knowledge center Mechanical ventilation units Buva Q-Stream, EcoStream, and other ventilation units HRV units Heat recovery and HRV systems Buva overhaul Everything about motor overhaul and repair Buva parts Motors, circuit boards, sensors, filters, and parts Buva is noisy Sound, vibrations, and wear Buva hums Constant hum or resonance Buva no longer rotates Motor does not start or respond Buva does not extract properly Poor extraction or moisture problems Buva bearings worn Grinding or squealing motor due to wear

Is your problem or model not listed?

Use our troubleshooter or part finder. We are happy to help you find the right solution for your Buva ventilation system.

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