BoilerFaultCodes red lockout neon High
Boiler Fault Code red lockout neon
Also written as REDLOCKOUTNEON — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code red lockout neon 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 for safety reasons and needs to be reset to try and fire up again. (As reported on Glow-worm Swift Flow 100)
Pick your boiler brand for the red lockout neon fix
Source
Information for the red lockout neon 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