BoilerFaultCodes E9 277 High
Boiler Fault Code E9 277
Also written as E9277 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E9 277 appears across 1 boiler brand and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has shut down because it has detected internal temperatures that are too high, often caused by poor water circulation or a blockage. (As reported on Worcester Bosch Hideaway)
Pick your boiler brand for the E9 277 fix
Source
Information for the E9 277 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