Chaffoteaux Kettling / Boiling in Heat Exchanger

Water heater makes loud banging or popping noises during operation.

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.

Possible Causes

Heavy limescale buildup in primary heat exchanger, Restricted water flow, Air pockets in heat exchanger

Safety: Turn off the heater if noises are violent or accompanied by overheating smells.

Check water flow: Ensure inlet filters are clean and taps are fully open.
Bleed air (if applicable): On models with internal circuits, bleed air from vents.
Descale primary heat exchanger: Use a pump and approved descaling solution to remove scale from the heat exchanger until noise is reduced.
Professional inspection: If kettling persists, the heat exchanger may be damaged and require replacement.

Hard 4/5

Primary Heat Exchanger

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