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

Typical repair cost for the boiler Lock-out signal lamp red fault is £150-300 including labour.

Lock-out signal lamp red High

Boiler Fault Code Lock-out signal lamp red

Also written as LOCKOUTSIGNALLAMPRED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Lock-out signal lamp red appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is failing to light the flame despite several attempts, meaning it has safely shut itself down to prevent a gas buildup. (As reported on Biasi Riva Compact HE MK2)

Pick your boiler brand for the Lock-out signal lamp red fix

Biasi Lock-out signal lamp red 5 models

Source

Information for the Lock-out signal lamp red 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 7 July 2026