Weishaupt
Kettling / Boiling in Heat Exchanger
Water heater makes loud banging or knocking noises when the burner runs.
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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.
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Possible Causes
Limescale buildup in primary heat exchanger, Poor water circulation, Incorrect gas rate causing local overheating, Air trapped in system
How to Fix / Troubleshooting
Safety: Persistent banging can damage the appliance; have it inspected promptly.
- Bleed air: On combi or storage Weishaupt units, bleed air from radiators and the automatic air vent on the unit.
- Check pump operation: Ensure the circulation pump is running and not seized. Listen for normal pump noise during operation.
- Descale heat exchanger: In hard water areas, arrange for a professional chemical descaling of the primary and/or plate heat exchanger.
- Combustion check: A technician should verify gas rate and combustion settings to prevent local overheating.
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Repair Difficulty
Hard
4/5
Required Part
Primary Heat Exchanger
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