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 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 struggling to clear exhaust gases properly, so it has safely shut itself down to prevent any risk. (As reported on Worcester Bosch Greenstar Ri)
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 7 July 2026