BoilerFaultCodes Er08+ Low
Boiler Fault Code Er08+
Also written as ER08 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Er08+ 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's outside temperature sensor has developed a fault or is sending incorrect data, which might stop the heating from adjusting correctly to the weather. (As reported on Biasi Activa)
Pick your boiler brand for the Er08+ fix
Source
Information for the Er08+ 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