E45 High

Boiler Fault Code E45

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E45 appears across 5 boiler brands and 17 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 an electrical fault with the sensor that monitors exhaust gases, causing the system to shut down for safety. (As reported on Keston C36)

Pick your boiler brand for the E45 fix

Biasi E45 1 model Johnson Starley E45 1 model Keston E45 9 models Remeha E45 5 models Vokera E45 1 model

Source

Information for the E45 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