BoilerFaultCodes 8 flashes High
Boiler Fault Code 8 flashes
Also written as 8FLASHES — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 8 flashes 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 tried to start but could not detect a flame, meaning it cannot heat your water or radiators and has shut down for safety. (As reported on Worcester Bosch Greenstar 35 CDi)
Pick your boiler brand for the 8 flashes fix
Source
Information for the 8 flashes 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