A09
Beretta
Flame Detection Instability / Combustion Disturbance
Boiler intermittently locks out with A09, especially in windy conditions, ignition attempts may be noisy.
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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
Incorrect gas valve adjustment, Flue terminal affected by wind (downdraft), Burner contamination, Faulty ionisation electrode or cable
How to Fix / Troubleshooting
Safety: Do not attempt to adjust gas settings yourself. Only a qualified gas technician may work on combustion settings.
- Observe conditions: Note if A09 occurs only during strong winds or specific weather. This can indicate flue terminal siting issues.
- Check flue terminal surroundings: Ensure no new structures, vents, or obstacles have been added near the terminal that could cause turbulence.
- Technician – combustion analysis: Perform a flue gas analysis on the Beretta boiler and adjust the gas valve according to manufacturer specifications.
- Technician – clean burner and electrodes: Remove burner, clean surfaces, and inspect ignition/ionisation electrodes. Replace if worn or cracked.
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Repair Difficulty
Professional Required
5/5
Required Part
Ionisation Electrode
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