BoilerFaultCodesVokera A06 Fault Code
The Vokera A06 fault code means: your boiler's internal computer has detected a safety control failure and has locked itself down as a precaution.. It appears on 4 Vokera models in our database.
Technical description: Safety relay does not close
What causes the Vokera A06 fault?
This fault occurs when the boiler's internal computer tries to engage a safety switch but detects that it has failed to close. The most common reason is a mechanical or electrical failure within the main circuit board, which prevents the system from confirming it is safe to ignite the burner. Because this involves a critical safety check, the boiler will prevent all operation to protect the household.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vokera models that show the A06 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A06 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