Baxi · DUO TEC Boilers
The boiler has detected wind conditions affecting the flue and has increased the minimum fan speed to compensate. This is usually a normal operational message, not a fault.
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No immediate action is required as the boiler is self-compensating.
If this occurs frequently, or if there are other operational issues, visually inspect the flue terminal outside the property for damage or improper installation.
A qualified technician can check the position of the flue duct terminal if concerned.