Keston Excessive Operational Noise

Boiler is very noisy during operation, with whistling, droning, or vibration

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.

Possible Causes

Worn fan bearings, Loose casing panels, Pump cavitation, Resonance in flue or pipework

How to Fix / Troubleshooting

Safety: Unusual noises can indicate developing faults. Do not ignore persistent or worsening sounds.

User actions:

Note when the noise occurs (start-up, running, DHW, CH) and describe it for the engineer.
Ensure nothing is touching or leaning against the boiler casing or flue.

Engineer actions:

Inspect the Keston fan for bearing wear or imbalance; replace if noisy.
Tighten all casing screws and brackets, and fit anti-vibration pads if needed.
Check pump for cavitation (gurgling) and ensure system is fully bled and pressure is correct.
Inspect flue supports and joints for resonance; adjust supports or add brackets.

Repair Difficulty

Medium 3/5

Required Part

Flue Fan Assembly

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