BoilerFaultCodes No light High
Boiler Fault Code No light
Also written as NOLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code No light appears across 1 boiler brand and 12 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler appears to have no power and the display is completely dead, meaning it cannot provide any heating or hot water. (As reported on Worcester Bosch Greenstar 12Ri)
Pick your boiler brand for the No light fix
Source
Information for the No 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