BoilerFaultCodes Flashing High
Boiler Fault Code Flashing
Also written as FLASHING — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flashing appears across 1 boiler brand and 3 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 a fault and has safely shut itself down to prevent damage, meaning you currently have no heating or hot water. (As reported on Potterton Envoy Plus)
Pick your boiler brand for the Flashing fix
Source
Information for the 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