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Mechanical Noise from Fan or Pump
Boiler is very noisy during operation, with whirring, grinding, or high-pitched sounds.
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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 fan bearings, Worn pump bearings, Air in pump, Loose mounting brackets
How to Fix / Troubleshooting
Safety: Isolate power before touching any moving parts.
- Identify noise source: Listen carefully to determine whether the noise is coming from the top (fan area) or lower front (pump area) of the boiler.
- Bleed pump (qualified person): If the pump is noisy and the system has recently been drained, vent the pump to remove air.
- Check mounting: Ensure the boiler casing and internal components are securely fixed and not vibrating against the frame.
- Replace worn components: Noisy fan or pump bearings usually indicate the need for replacement by an engineer.
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Repair Difficulty
Hard
4/5
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