BoilerFaultCodesBiasi Lock lamp / lock state Fault Code
Also written as LOCKLAMPLOCKSTATE — same fault.
The Biasi Lock lamp / lock state fault code means: your boiler has entered a safety lockout mode and stopped working because it failed to light or stay lit through several attempts.. It appears on 1 Biasi model in our database.
Technical description: The ignition device can lock the functioning of the boiler and stop its functioning up to the resetting intervention.
DIY fix possible
Check that your gas supply is active and other gas appliances are workingLocate the reset button or selector switch on the control panelTurn the selector to the 'R' (Reset) position for 2 seconds and then back to the on position
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Biasi models that show the Lock lamp / lock state fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi Lock lamp / lock state 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