BoilerFaultCodesBiasi Normally operating boiler Fault Code
Also written as NORMALLYOPERATINGBOILER — same fault.
The Biasi Normally operating boiler fault code means: your boiler is currently working as it should and is simply communicating that it is in normal operating mode for the season you have selected.. It appears on 3 Biasi models in our database.
Technical description: 1 second ON 1 second OFF (function control in Winter or Summer position)
DIY fix possible
No action is required as this light sequence indicates normal operation.Ensure your thermostat is set to the desired temperature.Ensure your timer or programmer is set to 'ON'.
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Biasi models that show the Normally operating boiler fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi Normally operating boiler fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.
- Biasi Riva Compact 24S (M90E.24S) manual (PDF)
- Biasi Riva Compact HE M96a manual (PDF)
- Biasi Riva Compact HE MK2 manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026