How much does it cost to fix boiler error code Lockout (Red) light on?

Typical repair cost for the boiler Lockout (Red) light on fault is £120-250 including labour.

Lockout (Red) light on High

Boiler Fault Code Lockout (Red) light on

Also written as LOCKOUTREDLIGHTON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lockout (Red) light on 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 stopped working because it couldn't light the flame, which means your heating and hot water will not turn on. (As reported on Potterton Performa SL HE 9 2)

Pick your boiler brand for the Lockout (Red) light on fix

Potterton Lockout (Red) light on 1 model

Source

Information for the Lockout (Red) light on 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