A12
Beretta
Air/Flue System Fault (General)
Boiler displays A12; no ignition; the fan may not start; the display may show a symbol for an air/flue fault.
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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
Incorrectly installed concentric flue, blocked air intake, faulty fan, or a faulty air pressure switch or wiring.
How to Fix / Troubleshooting
Safety: Do not operate the boiler with suspected flue or air intake issues.
- Check air intake: For concentric flues, ensure the outer ring (air intake) is not blocked by dirt, cobwebs, or building work.
- Technician – verify flue configuration: Confirm that the flue length, elbows, and terminal type comply with Beretta installation limits.
- Technician – test fan and pressure switch: Measure fan voltage and check that the air pressure switch closes when the fan runs. Replace faulty components.
- Inspect wiring: Check connectors between the fan, pressure switch, and PCB for a secure fit and no corrosion.
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Repair Difficulty
Professional Required
5/5
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