E0 High

Boiler Fault Code E0

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E0 appears across 2 boiler brands and 2 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 water isn't flowing through the outdoor unit properly, and it has failed to start ten times in a row. (As reported on Ideal HP290)

Pick your boiler brand for the E0 fix

Ideal E0 1 model Sime E0 1 model

Source

Information for the E0 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