BoilerFaultCodes Neon I1 High
Boiler Fault Code Neon I1
Also written as NEONI1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Neon I1 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 is failing to start because it detects that the internal fan system is not operating correctly, likely due to a sensor incorrectly reporting air pressure levels before the system has even begun to run. (As reported on Ideal Classic NF30–NF80)
Pick your boiler brand for the Neon I1 fix
Source
Information for the Neon I1 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