Boiler Fault Code 2.C

Also written as 2C — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 2.C appears across 2 boiler brands 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 currently running an automated sequence to remove trapped air from the system, which typically occurs after you first turn the power on or restart the unit. (As reported on Worcester Bosch Greenstar CDi Compact)