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 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is having trouble communicating with an outdoor sensor used to monitor the weather, but it should still be able to provide heating and hot water. (As reported on Biasi ActivA 18S)

Pick your boiler brand for the Er08 fix

Biasi Er08 3 models

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 7 July 2026