Boiler and pipework vibrate or make humming noises when running

Safety: Secure ladders or access equipment when working near vibrating pipework.

• Adjust pump speed: Reduce pump speed if set unnecessarily high, following Viessmann guidelines.
• Open valves fully: Ensure isolation and balancing valves are not almost closed, which can cause whistling and vibration.
• Bleed air: Remove air from radiators and high points.
• Support pipework: Add or adjust pipe clips to prevent pipes from resonating against walls or other structures.