BoilerFaultCodes C6 216 High
Boiler Fault Code C6 216
Also written as C6216 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C6 216 appears across 1 boiler brand and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's air circulation system isn't spinning fast enough to safely vent exhaust gases, so it has stopped working to prevent a risk. (As reported on Worcester Bosch Greenstar 12i System)
Pick your boiler brand for the C6 216 fix
Source
Information for the C6 216 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