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

Typical repair cost for the Biasi lock-out fault is £90-280 including labour.

lock-out High

Biasi lock-out Fault Code

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

Your boiler has switched itself off because it has detected that it is getting too hot or there is a problem with the exhaust temperature.

Also written as LOCKOUT — same fault.

The Biasi lock-out fault code means: your boiler has switched itself off because it has detected that it is getting too hot or there is a problem with the exhaust temperature.. It appears on 2 Biasi models in our database.

Technical description: Safety thermostat or flue temperature probe lockout

Typical repair cost £90-280 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure the system pressure is between 1 and 1.5 bar on the gaugePress the 'Reset' button on the front control panel and hold for 2-5 seconds

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Biasi models that show the lock-out fault code

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

Source

Biasi lock-out 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