E9 High

Boiler Fault Code E9

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E9 appears across 4 boiler brands and 54 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has identified an internal electronic fault or has reached an unsafe temperature, causing it to shut down for safety. (As reported on Remeha Quinta Ace 25)

Pick your boiler brand for the E9 fix

Ideal E9 1 model Main E9 1 model Remeha E9 9 models Worcester Bosch E9 43 models

Source

Information for the E9 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