BoilerFaultCodes E01-601 Medium
Boiler Fault Code E01-601
Also written as E01601 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01-601 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 is struggling to remove trapped air from the system, which can prevent heat from circulating properly to your radiators. (As reported on Worcester Bosch 24i RSF)
Pick your boiler brand for the E01-601 fix
Source
Information for the E01-601 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