BoilerFaultCodes C neon flashing High
Boiler Fault Code C neon flashing
Also written as CNEONFLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code C neon flashing 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 water isn't moving through the internal pipes effectively, which prevents it from heating up safely. (As reported on Baxi Combi 130e)
Pick your boiler brand for the C neon flashing fix
Source
Information for the C neon flashing 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