BoilerFaultCodes 216 / C6 High
Boiler Fault Code 216 / C6
Also written as 216C6 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 216 / 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 fan responsible for moving air is not spinning fast enough, causing the system to stop working to ensure safety. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the 216 / C6 fix
Source
Information for the 216 / 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