Normally operating boiler Low

Biasi 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 1 Biasi model in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: 1 second ON 1 second OFF (function control in Winter or Summer position)
Typical repair cost £0 (including labour)

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.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026