BoilerFaultCodes All neons flashing High
Boiler Fault Code All neons flashing
Also written as ALLNEONSFLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code All neons flashing 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 detected a system error or internal failure that is preventing it from starting up correctly. (As reported on Potterton Performa 28i)
Pick your boiler brand for the All neons flashing fix
Source
Information for the All neons 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