BoilerFaultCodes 215 / C6 High
Boiler Fault Code 215 / C6
Also written as 215C6 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 215 / C6 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 has detected that the internal exhaust fan is spinning faster than it should for safety reasons, so it has automatically shut down to prevent potential issues. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 215 / C6 fix
Source
Information for the 215 / C6 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