How much does it cost to fix Biasi error code Lock state?

Typical repair cost for the Biasi Lock state fault is £90-280 including labour.

Lock state High

Biasi Lock state Fault Code

Q: What does the Biasi Lock state fault code mean?

Your boiler has shut down completely for safety because it failed to light or stay lit after several attempts.

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.

Typical repair cost £90-280 (including labour)

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 27 April 2026