BoilerFaultCodes 264 C1 High
Boiler Fault Code 264 C1
Also written as 264C1 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 264 C1 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has detected that the internal fan is not moving air correctly, so it has safely shut down to prevent unsafe operation. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the 264 C1 fix
Source
Information for the 264 C1 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