BoilerFaultCodes 2 lights flashing fast High
Boiler Fault Code 2 lights flashing fast
Also written as 2LIGHTSFLASHINGFAST — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 2 lights flashing fast 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 failed to ignite properly, meaning it cannot create the flame needed to heat your home or water. (As reported on Worcester Bosch Greenstar Si)
Pick your boiler brand for the 2 lights flashing fast fix
Source
Information for the 2 lights flashing fast 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