C13 Emergency

Boiler Fault Code C13

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code C13 appears across 4 boiler brands and 5 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 bring enough fresh air in or push exhaust gases out, which has triggered a safety shut-down to prevent harmful fumes from entering your home. (As reported on Main Eco Compact Combi)

Pick your boiler brand for the C13 fix

Baxi C13 1 model Gledhill C13 1 model Keston C13 2 models Main C13 1 model

Source

Information for the C13 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