Boiler and nearby pipework vibrate excessively during operation; you may hear humming or buzzing.

Safety first: Turn off power before tightening any mechanical fasteners.

• Check boiler mounting: Ensure wall brackets and fixing screws are tight and that the boiler is level.
• Inspect pipe supports: Add or adjust pipe clips to prevent pipes from rattling against walls or each other. Use anti-vibration mounts where possible.
• Listen for source: Identify whether vibration is coming from the fan, pump, or another component to guide repair.
• Professional balancing: If the fan or pump is unbalanced or worn, a technician should replace the affected component.