E3 High

Boiler Fault Code E3

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E3 appears across 6 boiler brands and 44 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your system's main temperature sensor is sending incorrect information, which means your heating might not work efficiently or at all. (As reported on Ideal HP290)

Pick your boiler brand for the E3 fix

Baxi E3 23 models Firebird E3 7 models Ideal E3 1 model Remeha E3 11 models Viessmann E3 1 model Worcester Bosch E3 1 model

Source

Information for the E3 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