Boiler Fault Code 276 E9

Also written as 276E9 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code 276 E9 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 detected that the water inside has become dangerously hot and has shut itself down to prevent damage or overheating. (As reported on Worcester Bosch Greenstar 12i System)