BoilerFaultCodes Blue light off High
Boiler Fault Code Blue light off
Also written as BLUELIGHTOFF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Blue light off 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 currently has no power, which means it cannot provide hot water or heating until the electrical connection is restored. (As reported on Worcester Bosch Greenstar i Junior)
Pick your boiler brand for the Blue light off fix
Source
Information for the Blue light off 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