How much does it cost to fix boiler error code lock-out signal lamp?

Typical repair cost for the boiler lock-out signal lamp fault is £100-350 including labour.

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Boiler Fault Code lock-out signal lamp

Also written as LOCKOUTSIGNALLAMP — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code lock-out signal lamp 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 stopped working for safety reasons and needs to be manually restarted to attempt to fire up again. (As reported on Biasi Riva Compact HE M96a)

Pick your boiler brand for the lock-out signal lamp fix

Biasi lock-out signal lamp 1 model

Source

Information for the lock-out signal lamp 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