How much does it cost to fix boiler error code Lock-out reset button is lit?

Typical repair cost for the boiler Lock-out reset button is lit fault is £120-250 including labour.

Lock-out reset button is lit High

Boiler Fault Code Lock-out reset button is lit

Also written as LOCKOUTRESETBUTTONISLIT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lock-out reset button is lit 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 problem with the combustion process and has safely shut itself down to prevent any hazards. (As reported on Grant Vortex Combi 70)

Pick your boiler brand for the Lock-out reset button is lit fix

Grant Lock-out reset button is lit 1 model

Source

Information for the Lock-out reset button is lit 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