BoilerFaultCodes LED flashing after fan High
Boiler Fault Code LED flashing after fan
Also written as LEDFLASHINGAFTERFAN — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code LED flashing after fan appears across 1 boiler brand and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is unable to start up safely because the internal fan, which clears waste gases, is not spinning correctly or communicating with the control board. (As reported on Sime Ecomfort HE Combi)
Pick your boiler brand for the LED flashing after fan fix
Source
Information for the LED flashing after fan 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