BoilerFaultCodes neon flashing High
Boiler Fault Code neon flashing
Also written as NEONFLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code neon flashing appears across 2 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that the water temperature has got too hot and has shut itself down as a safety precaution. (As reported on Potterton Performa 30 HE)
Pick your boiler brand for the neon flashing fix
Source
Information for the neon flashing 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