How much does it cost to fix Biasi error code lock-out light?

Typical repair cost for the Biasi lock-out light fault is £100-350 including labour.

lock-out light High

Biasi lock-out light Fault Code

Q: What does the Biasi lock-out light fault code mean?

Your boiler has shut down for safety because it either failed to light, sensed it was getting too hot, or detected an issue with how it clears waste gases.

Also written as LOCKOUTLIGHT — same fault.

The Biasi lock-out light fault code means: your boiler has shut down for safety because it either failed to light, sensed it was getting too hot, or detected an issue with how it clears waste gases.. It appears on 1 Biasi model in our database.

Technical description: The boiler goes into the safety lock-out state (memorizes lock) if the ignition period ends without flame presence, if the safety thermostat opens the circuit, or if the air pressure switch is not at work when it should be.

Typical repair cost £100-350 (including labour)

DIY fix possible

Check that your gas pre-payment meter (if applicable) has credit.Ensure any external gas isolation valves are fully open.Press and release the reset button on the front control panel to see if the boiler restarts.

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Biasi models that show the lock-out light fault code

Click a model for the full fault code list and model-specific repair notes.

Garda M90f Repair: £100-350

Source

Biasi lock-out light 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