Fondital
Mechanical Vibration / Fan or Pump Imbalance
Boiler vibrates excessively or resonates through the flue and pipework 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 bearings in Fondital flue fan, Debris in fan impeller, Pump cavitation due to air or low pressure, Poorly supported pipework transmitting vibration
How to Fix / Troubleshooting
Safety: Excessive vibration can damage components. Switch off the boiler if noise is severe.
User checks:
- System pressure: Ensure adequate pressure (1.0–1.5 bar cold) to prevent pump cavitation.
- Air removal: Bleed radiators to reduce air in the system.
- Pipe supports: Check visible pipes near the boiler are clipped and not touching walls loosely.
Technician actions:
- Inspect and balance or replace the flue fan assembly if noisy or vibrating.
- Check the circulation pump for bearing noise and replace if worn.
- Add or adjust pipe clips and anti-vibration mounts.
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Repair Difficulty
Medium
3/5
Required Part
Flue Fan Motor
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