How much does it cost to fix boiler error code Boiler locks out?

Typical repair cost for the boiler Boiler locks out fault is £150-300 including labour.

Boiler locks out High

Boiler Fault Code Boiler locks out

Also written as BOILERLOCKSOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Boiler locks out 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 detected a safety issue with overheating or power delivery and has shut itself down to prevent damage, meaning you currently have no heating or hot water. (As reported on Ferroli Sigma 40 FF)

Pick your boiler brand for the Boiler locks out fix

Ferroli Boiler locks out 1 model

Source

Information for the Boiler locks out 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