BoilerFaultCodes F9 n High
Boiler Fault Code F9 n
Also written as F9N — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F9 n 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's electronic control board hasn't been properly configured to recognize the type of gas being supplied to your home. (As reported on Ideal i-mini2 C24)
Pick your boiler brand for the F9 n fix
Source
Information for the F9 n 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