é3 Low

Boiler Fault Code é3

Also written as 3 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code é3 appears across 6 boiler brands and 18 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning This code is not actually an error; it simply indicates that your boiler is currently running to provide heating for your radiators. (As reported on Remeha Avanta 18V)

Pick your boiler brand for the é3 fix

Biasi é3 2 models Chaffoteaux é3 2 models Daikin é3 3 models Dimplex é3 1 model Halstead é3 1 model Remeha é3 9 models

Source

Information for the é3 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