BoilerFaultCodes 24:1 Low
Boiler Fault Code 24:1
Also written as 241 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 24:1 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 simply reminding you that it is time for its regular annual service to ensure it continues to run safely and efficiently. (As reported on Viessmann Vitodens 333)
Pick your boiler brand for the 24:1 fix
Source
Information for the 24:1 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