BoilerFaultCodesVokera 4254 Fault Code
The Vokera 4254 fault code means: your boiler has detected that air is trapped inside the system, which is preventing it from circulating heat effectively.. It appears on 1 Vokera model in our database.
Technical description: Auto Air Vent
DIY fix possible
Check your boiler pressure gauge to ensure it is between 1 and 1.5 barBleed all radiators in your home starting from the lowest floor to the highestTop up the system pressure again using the filling loop if it dropped while bleedingRestart the boiler to clear the fault
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Vokera models that show the 4254 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 4254 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026