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

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

Lockout (Rapid Flashing Red) High

Boiler Fault Code Lockout (Rapid Flashing Red)

Also written as LOCKOUTRAPIDFLASHINGRED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Lockout (Rapid Flashing Red) appears across 1 boiler brand 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 failed to start after several attempts and has switched itself off for safety, usually because it cannot detect a flame or is struggling to get fuel. (As reported on Potterton Profile 60E)

Pick your boiler brand for the Lockout (Rapid Flashing Red) fix

Potterton Lockout (Rapid Flashing Red) 2 models

Source

Information for the Lockout (Rapid Flashing Red) 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