E5 High

Boiler Fault Code E5

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E5 appears across 5 boiler brands and 37 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your heat pump has stopped working because one of its outdoor temperature sensors is sending an incorrect or missing signal to the main control board. (As reported on Ideal HP290)

Pick your boiler brand for the E5 fix

Firebird E5 8 models Ideal E5 1 model Remeha E5 11 models Viessmann E5 9 models Worcester Bosch E5 8 models

Source

Information for the E5 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