A11
Beretta
Flue Overheat Lockout
Boiler displays A11, burner stops, fan may continue to run, possible smell of overheating from flue area.
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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
Severely restricted flue, Incorrect flue length or configuration, Failed flue overheat thermostat, Fan not providing adequate extraction
How to Fix / Troubleshooting
Safety: Turn off the boiler and do not use it until the flue system has been checked. Risk of flue gas spillage.
- Visual external check: Confirm the flue terminal is unobstructed and correctly positioned according to local regulations.
- Technician – flue inspection: A qualified engineer should inspect the entire flue run for blockages, collapsed sections, or incorrect slopes.
- Technician – test flue thermostat: Check continuity and operation temperature of the Beretta flue overheat thermostat. Replace if it trips at too low a temperature.
- Fan performance: Verify fan speed and pressure. Replace the fan if it cannot maintain proper extraction.
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Repair Difficulty
Professional Required
5/5
Required Part
Flue Overheat Thermostat
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