BoilerFaultCodes Er02 High
Boiler Fault Code Er02
Also written as ER02 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er02 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 switched itself off because it has detected an overheating issue, which prevents it from operating until the fault is corrected. (As reported on Biasi Concept 400 20 1 Mfs)
Pick your boiler brand for the Er02 fix
Source
Information for the Er02 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