BoilerFaultCodesVokera A01 Fault Code
The Vokera A01 fault code means: your boiler has tried to light several times but has failed, likely because gas is not reaching the burner or the spark is not working.. It appears on 1 Vokera model in our database.
Technical description: 5 failed attempts at ignition
What causes the Vokera A01 fault?
This fault occurs when the boiler's control system fails to detect a flame after five attempts to start. The most common reasons are a lack of gas reaching the unit, a worn-out spark electrode that cannot jump the gap to light the fuel, or a faulty gas valve that isn't opening correctly.
This fault is slightly more common during the first cold snap of winter when gas valves that have been dormant all summer can occasionally stick.
DIY fix possible
Check that your gas meter has credit and the isolation valve is openCheck if other gas appliances in your home, such as a hob, are working correctlyPress the 'Reset' button on the control panel to attempt a restart
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Gas Safe Register →Vokera models that show the A01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A01 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