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

Typical repair cost for the boiler Lock-out signal lamp OFF fault is £120-350 including labour.

Lock-out signal lamp OFF High

Boiler Fault Code Lock-out signal lamp OFF

Also written as LOCKOUTSIGNALLAMPOFF — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lock-out signal lamp OFF 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 is failing to start up for central heating even though no warning lights are showing, meaning the ignition sequence is failing at various stages. (As reported on Biasi Riva Compact 24S)

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

Biasi Lock-out signal lamp OFF 1 model

Source

Information for the Lock-out signal lamp OFF 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