BoilerFaultCodesVokera A11 Fault Code
The Vokera A11 fault code means: your boiler is unable to start up safely because the fan that removes waste gases is not spinning correctly.. It appears on 1 Vokera model in our database.
Technical description: Fan error
What causes the Vokera A11 fault?
This fault occurs when the boiler's internal computer detects that the fan is not spinning at the correct speed required to safely clear exhaust gases. The most common reason is a mechanical failure within the fan motor or a communication break in the wiring that tells the fan when to start. Without a functioning fan, the boiler will refuse to ignite as a vital safety precaution.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the A11 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A11 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