BoilerFaultCodesVokera A02 Fault Code
The Vokera A02 fault code means: your boiler has tried to start several times but cannot light the gas to begin heating.. It appears on 1 Vokera model in our database.
Technical description: Too many failed ignitions
What causes the Vokera A02 fault?
This fault occurs when the boiler's control system attempts to light the burner several times but fails to detect a stable flame. The most common reasons are a lack of gas reaching the unit, worn-out spark electrodes that can no longer create a light, or a dirty sensor that cannot 'see' the flame even if it has ignited.
This fault is more common during the first cold snap of winter, as debris in the gas line or moisture on the electrodes can prevent ignition after the boiler has been inactive over summer.
DIY fix possible
Check that your gas emergency control valve is in the 'on' positionIf you have a pre-payment meter, check that you have sufficient creditPress the reset button or turn the selector switch to 'OFF/RESET' for 5 seconds and then back to 'ON'
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Gas Safe Register →Vokera models that show the A02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A02 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