BoilerFaultCodesBiasi Lock state Fault Code
Also written as LOCKSTATE — same fault.
The Biasi Lock state fault code means: your boiler has shut down completely for safety because it failed to light or stay lit after several attempts.. It appears on 2 Biasi models in our database.
Technical description: The ignition device can lock the functioning of the boiler and stop its functioning up to the resetting intervention. The lock is signalled by the ignition of the lock lamp.
DIY fix possible
Check if your gas supply is active and credit is on the meterPress the 'Reset' button (located next to the lockout lamp) for five secondsMonitor if the blue burner light stays on after the reset
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Biasi models that show the Lock state fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi 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