BoilerFaultCodes DHW light High
Boiler Fault Code DHW light
Also written as DHWLIGHT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code DHW light appears across 1 boiler brand and 2 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 hot water inside it has become dangerously hot. (As reported on Worcester Bosch Greenstar 25Si)
Pick your boiler brand for the DHW light fix
Source
Information for the DHW 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