BoilerFaultCodes Er01 High
Boiler Fault Code Er01
Also written as ER01 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er01 appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has failed to light the flame and has locked itself down for safety, meaning you currently have no heating or hot water. (As reported on Biasi Riva Plus HE)
Pick your boiler brand for the Er01 fix
Source
Information for the Er01 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