BoilerFaultCodes Flashes red High
Boiler Fault Code Flashes red
Also written as FLASHESRED — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Flashes red appears across 1 boiler brand 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 has stopped heating because the internal water pump, which moves hot water around your house, has seized up or failed and cannot restart itself. (As reported on Grant Vortex Eco)
Pick your boiler brand for the Flashes red fix
Source
Information for the Flashes red 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