BoilerFaultCodes Does fan run? (NO) High
Boiler Fault Code Does fan run? (NO)
Also written as DOESFANRUNNO — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Does fan run? (NO) appears across 1 boiler brand and 2 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 the internal air extraction fan, which is essential for safe operation, is not receiving power or has stopped working. (As reported on Saunier Duval Xeon 30ff)
Pick your boiler brand for the Does fan run? (NO) fix
Source
Information for the Does fan run? (NO) 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 27 April 2026