BoilerFaultCodesBiasi LP Fault Code
The Biasi LP fault code means: your boiler has been manually set to a special testing mode used by engineers to check its performance, rather than operating in its normal heating mode.. It appears on 4 Biasi models in our database.
Technical description: Activation of the chimney sweep function at minimum output
DIY fix possible
Locate the chimney sweep or service button on the control panelPress the button once to deactivate the functionIf the code remains, turn the boiler off at the power switch for 30 seconds and restart
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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 31 August 2026