BoilerFaultCodes Fan start up High
Boiler Fault Code Fan start up
Also written as FANSTARTUP — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Fan start up 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 cannot properly clear away exhaust gases before igniting. (As reported on Ideal British Gas RD)
Pick your boiler brand for the Fan start up fix
Source
Information for the Fan start up 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