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

Typical repair cost for the boiler Lockout (Red) On fault is £100-350 including labour.

Lockout (Red) On High

Boiler Fault Code Lockout (Red) On

Also written as LOCKOUTREDON — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lockout (Red) 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 tried and failed to light the flame several times, so it has shut itself down for safety. (As reported on Potterton Performa SL HE 9 2)

Pick your boiler brand for the Lockout (Red) On fix

Potterton Lockout (Red) On 1 model

Source

Information for the Lockout (Red) 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