BoilerFaultCodes Double flash Blue light Emergency
Boiler Fault Code Double flash Blue light
Also written as DOUBLEFLASHBLUELIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Double flash Blue light appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has automatically turned itself off because the exhaust area is getting too hot, indicating a potential blockage or a problem with how the gases are clearing. (As reported on Worcester Bosch Greenstar i Junior)
Pick your boiler brand for the Double flash Blue light fix
Source
Information for the Double flash Blue light 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