BoilerFaultCodes T6 High
Boiler Fault Code T6
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code T6 appears across 2 boiler brands 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 has detected an internal safety electronic error and has stopped working to prevent a malfunction. (As reported on Worcester Bosch Greenstar Si Combi / i System)
Pick your boiler brand for the T6 fix
Source
Information for the T6 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