E02 High

Boiler Fault Code E02

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E02 appears across 10 boiler brands and 32 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has stopped working because water is not moving through the system properly, which is causing it to overheat and shut down for safety. (As reported on Ravenheat CSI 120)

Pick your boiler brand for the E02 fix

Alpha E02 1 model Ariston E02 4 models Baxi E02 1 model Biasi E02 9 models ECA E02 4 models Keston E02 4 models Navien E02 1 model Ravenheat E02 3 models Vokera E02 2 models Warmflow E02 3 models

Source

Information for the E02 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