Display shows A12; unit may start then quickly shut down, often with fan running at high speed.
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.
Possible Causes
How to Fix / Troubleshooting
Safety: This is a combustion safety fault. Switch off the appliance and do not use it until the flue system and sensor have been checked by a professional.
User checks:
- External flue inspection: Confirm the terminal is unobstructed and correctly positioned per local regulations.
- Power reset: After a full power-off period (at least 30 seconds), restore power and see if the fault clears temporarily. If it returns, further use is unsafe.
Professional tasks: Internal flue inspection, sensor testing, and replacement of the Ferroli flue gas sensor or control board must be carried out by a qualified technician.
Repair Difficulty
Required Part
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