Vaillant
Mechanical Noise from Pump, Fan, or Burner
Water heater is unusually noisy, with humming or grinding sounds during operation
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn pump bearings, Fan motor wear or imbalance, Loose mounting brackets, Air in system causing cavitation
How to Fix / Troubleshooting
Safety: Isolate power and gas before touching moving parts.
- Identify noise source: With the cover removed and appropriate safety precautions, briefly run the appliance to locate whether the noise comes from the pump, fan, or burner area.
- Check pump: If the noise is from the pump, bleed air and check for debris. Replace the pump if bearings are worn or if noise persists.
- Inspect fan: Check the fan impeller for damage or imbalance and ensure mounting screws are tight. Replace the fan assembly if noisy.
- Tighten fixings: Tighten any loose brackets, screws, or panels that may be vibrating.
- Re-test: After adjustments or replacements, run the heater and confirm noise levels are normal.
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Repair Difficulty
Medium
3/5
Required Part
Circulation Pump
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