BoilerFaultCodes Er10 Emergency
Boiler Fault Code Er10
Also written as ER10 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er10 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has shut down because it has detected that the exhaust gases are becoming dangerously hot, which usually indicates a blockage or a heat exchange problem. (As reported on Biasi ActivA 18S)
Pick your boiler brand for the Er10 fix
Source
Information for the Er10 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