BoilerFaultCodesVokera 12 Fault Code
The Vokera 12 fault code means: your boiler is attempting to restart its ignition process because it failed to light or maintain a flame.. It appears on 4 Vokera models in our database.
Technical description: restart ignition
What causes the Vokera 12 fault?
This fault occurs when the boiler's control system senses that a flame has not been successfully established or maintained after several attempts. The most common reasons are a lack of gas reaching the burner, worn-out spark electrodes that can no longer ignite the fuel, or a faulty sensor that fails to 'see' the flame even when it is lit.
This fault can be more common during extreme cold snaps if the external gas regulator or meter freezes, restricting the flow of gas to the appliance.
DIY fix possible
Check if your gas supply is turned on and other gas appliances are workingPress the reset button or turn the selector switch to 'OFF/RESET' for several secondsEnsure the condensate pipe (the white plastic pipe outside) isn't frozen if it is winter
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Gas Safe Register →Vokera models that show the 12 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 12 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 27 April 2026