BoilerFaultCodes Neon I3 Low
Boiler Fault Code Neon I3
Also written as NEONI3 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Neon I3 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has electrical power and is currently functioning normally, as this light simply indicates the mains power is switched on. (As reported on Ideal Classic HE)
Pick your boiler brand for the Neon I3 fix
Source
Information for the Neon I3 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 7 July 2026