BoilerFaultCodes High neon light Medium
Boiler Fault Code High neon light
Also written as HIGHNEONLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code High neon light 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's status light indicates it is running at its maximum heating power, but if the light remains off while the boiler is struggling, there may be an internal electrical communication fault. (As reported on Glow-worm EnergySaver)
Pick your boiler brand for the High neon light fix
Source
Information for the High neon light 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