E08 High

Boiler Fault Code E08

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E08 appears across 6 boiler brands and 23 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 a fault with the temperature sensor for your hot water, which means it cannot safely heat the water for your taps. (As reported on Potterton Powermax HE)

Pick your boiler brand for the E08 fix

Ariston E08 5 models Biasi E08 10 models ECA E08 1 model Keston E08 3 models Potterton E08 2 models Vokera E08 2 models

Source

Information for the E08 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 7 July 2026