BoilerFaultCodes Er High
Boiler Fault Code Er
Also written as ER — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er 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 encountered a general safety error and has shut itself down to prevent damage, requiring you to attempt a reset before calling for professional help. (As reported on Biasi Advance Plus 16S 25S 30S)
Pick your boiler brand for the Er fix
Source
Information for the Er 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