BoilerFaultCodes E.01.12 High
Boiler Fault Code E.01.12
Also written as E0112 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E.01.12 appears across 1 boiler brand and 7 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has sensed that the water returning from your radiators is hotter than the water leaving the boiler, which usually means there is a circulation problem or a sensor fault. (As reported on Baxi 800)
Pick your boiler brand for the E.01.12 fix
Source
Information for the E.01.12 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