BoilerFaultCodes 4254 Medium
Boiler Fault Code 4254
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 4254 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 has detected that air is trapped inside the system, which is preventing it from circulating heat effectively. (As reported on Vokera Maxin)
Pick your boiler brand for the 4254 fix
Source
Information for the 4254 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