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

Typical repair cost for the boiler Lock-out state fault is £100-350 including labour.

Lock-out state High

Boiler Fault Code Lock-out state

Also written as LOCKOUTSTATE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lock-out state appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has attempted to light itself four times without success and has turned itself off for safety. (As reported on Biasi Riva Advance M96.24SM)

Pick your boiler brand for the Lock-out state fix

Biasi Lock-out state 2 models

Source

Information for the Lock-out state 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