Atlantic
Kettling / Localized Boiling in Heat Exchanger
Boiler makes loud banging or knocking noises (kettling) during operation, especially when heating starts or stops.
Advertisements
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.
Advertisements
Possible Causes
Limescale buildup in primary heat exchanger, Sludge in system water, Insufficient flow rate, Incorrect pump speed setting
How to Fix / Troubleshooting
Safety: Noisy operation can indicate overheating. Do not ignore persistent banging.
- Check system pressure: Ensure pressure is within the recommended range. Low pressure can reduce flow and cause kettling.
- Bleed radiators and boiler: Remove trapped air to improve circulation.
- Adjust pump speed: If the pump has selectable speeds, set it to a higher speed to increase flow through the heat exchanger.
- Professional cleaning: A technician should chemically flush the system, descale the primary heat exchanger if necessary, and add inhibitor to prevent future buildup.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements