BoilerFaultCodes NEON5 High
Boiler Fault Code NEON5
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code NEON5 appears across 2 boiler brands and 8 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has switched itself off because it has detected that the water inside has become dangerously hot. (As reported on Glow-worm Hideaway 40B)
Pick your boiler brand for the NEON5 fix
Source
Information for the NEON5 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