Boiler Fault Code E01.04

Also written as E0104 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026

Fault code E01.04 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is repeatedly failing to keep its flame lit, so it has locked itself for safety to prevent a build-up of unburnt gas. (As reported on Remeha Quinta Ace 30)