BoilerFaultCodes 5 flashes green High
Boiler Fault Code 5 flashes green
Also written as 5FLASHESGREEN — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 5 flashes green appears across 3 boiler brands and 6 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's internal computer has become confused or has developed a hardware fault, meaning it can no longer communicate correctly with its own components. (As reported on Baxi 613 Heat)
Pick your boiler brand for the 5 flashes green fix
Source
Information for the 5 flashes green 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