Lock lamp / lock state High

Biasi 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.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The ignition device can lock the functioning of the boiler and stop its functioning up to the resetting intervention.
Typical repair cost £100-280 (including labour)

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 27 April 2026