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

Typical repair cost for the boiler Lock state cause fault is £120-280 including labour.

Lock state cause High

Boiler Fault Code Lock state cause

Also written as LOCKSTATECAUSE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lock state cause appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because it has reached an unsafe temperature, likely due to a blockage or a failure in how the water is moving through the system. (As reported on Biasi Gaia)

Pick your boiler brand for the Lock state cause fix

Biasi Lock state cause 1 model

Source

Information for the Lock state cause fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026