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

Typical repair cost for the boiler Boiler Lock-out fault is £120-300 including labour.

Boiler Lock-out High

Boiler Fault Code Boiler Lock-out

Also written as BOILERLOCKOUT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Boiler Lock-out appears across 2 boiler brands 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 stopped working because it failed to start or stay lit, meaning your heating and hot water will not function. (As reported on Saunier Duval Semia Condens F30 E)

Pick your boiler brand for the Boiler Lock-out fix

Ferroli Boiler Lock-out 1 model Saunier Duval Boiler Lock-out 1 model

Source

Information for the Boiler Lock-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