BoilerFaultCodes Err.2 Low
Boiler Fault Code Err.2
Also written as ERR2 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Err.2 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 is displaying a stored memory of an old problem that occurred two errors ago, rather than a current issue preventing it from working. (As reported on Atag Q 25S)
Pick your boiler brand for the Err.2 fix
Source
Information for the Err.2 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