BoilerFaultCodes Group 2, 9 flashes High
Boiler Fault Code Group 2, 9 flashes
Also written as GROUP29FLASHES — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Group 2, 9 flashes 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 detected that the water returning to it is too hot, causing it to shut down to prevent damage to its internal parts. (As reported on Worcester Bosch Greenstar CDi Compact)
Pick your boiler brand for the Group 2, 9 flashes fix
Source
Information for the Group 2, 9 flashes 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