LP Low

Biasi LP Fault Code

The Biasi LP fault code means: your boiler has been accidentally switched into a specific testing mode used by engineers to check emissions, which prevents it from heating your home normally.. It appears on 8 Biasi models 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: Activation of the chimney sweep function at minimum output

DIY fix possible

Locate the control panel on the front of your boiler.Look for a button or setting labeled 'Chimney Sweep' or indicated by a chimney icon.Press or toggle this button to deactivate the mode and return the boiler to its normal operating state.

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Biasi models that show the LP fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Biasi LP 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 7 July 2026