Boiler makes loud banging or knocking noises when starting or stopping

Safety: Noisy operation can indicate overheating. Monitor boiler temperature and shut it down if pressure or temperature exceed normal limits.

• Bleed air: Air in the system can cause banging. Bleed radiators and use the boiler's air vent to remove trapped air.
• Check flow: Ensure all valves on the primary loop are open and that the circulator pump is operating correctly.
• Inspect piping supports: Secure any loose copper or PEX piping with proper clamps to reduce movement.
• Descale heat exchanger: If kettling (tea-kettle-like boiling sounds) is present, a technician should chemically descale the Dettson heat exchanger following manufacturer guidelines.