BoilerFaultCodes 7 flashes High
Boiler Fault Code 7 flashes
Also written as 7FLASHES — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 7 flashes 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 has overheated because the water inside is not moving correctly or has become too hot, causing a safety sensor to shut the system down. (As reported on Worcester Bosch Greenstar 25CDi)
Pick your boiler brand for the 7 flashes fix
Source
Information for the 7 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