Ferroli
Kettling / Hydraulic Shock
Loud banging or knocking noises from Ferroli furnace when starting or stopping heating.
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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 Ferroli primary heat exchanger, Air in system causing water hammer, Pump speed set incorrectly, Rapid temperature rise due to poor circulation
How to Fix / Troubleshooting
Safety: No immediate danger in most cases, but turn off power if noises are violent or continuous.
Steps:
- Bleed system: Remove air from radiators and high points to reduce water hammer.
- Check pump setting: If the Ferroli pump has adjustable speeds, set it to the recommended speed per manual.
- Verify valves: Ensure all radiator and bypass valves are correctly set to allow adequate flow.
Professional help: A technician may need to chemically descale the heat exchanger and balance the system to eliminate kettling.
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Repair Difficulty
Medium
3/5
Required Part
Primary Heat Exchanger
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