BoilerFaultCodes CFL100 Emergency
Boiler Fault Code CFL100
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code CFL100 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 an issue with the air supply or exhaust system, meaning it is not venting fumes correctly and has safely shut down to prevent a hazard. (As reported on Potterton Kingfisher MF RSL/CFL)
Pick your boiler brand for the CFL100 fix
Source
Information for the CFL100 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