Keston
Kettling / Localised Boiling in Heat Exchanger
Boiler makes loud banging or kettling noises during operation
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 build-up in primary heat exchanger, Sludge in system, Low flow rate, Incorrect pump speed
How to Fix / Troubleshooting
Safety: Persistent banging can damage the boiler. Do not ignore this symptom.
User actions:
- Check system pressure and top up if below 1.0 bar.
- Ensure radiators are bled and that valves are open to allow good circulation.
- Reduce boiler flow temperature slightly on the control panel to lessen stress until serviced.
Engineer actions:
- Assess the Keston primary heat exchanger for scale and sludge; perform a chemical clean or replace the exchanger if heavily fouled.
- Powerflush the heating system and fit a magnetic filter to capture ongoing debris.
- Verify pump performance and adjust speed to ensure adequate flow through the boiler.
- Check bypass valve setting to maintain minimum flow.
Advertisements
Repair Difficulty
Hard
4/5
Required Part
Primary Heat Exchanger
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements