BoilerFaultCodes E01---205 High
Boiler Fault Code E01---205
Also written as E01205 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01---205 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 failing to heat your tap water correctly because the internal heat exchanger is likely blocked or faulty. (As reported on Biasi Riva Compact 24S)
Pick your boiler brand for the E01---205 fix
Source
Information for the E01---205 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 27 April 2026