BoilerFaultCodesVokera A08 Fault Code
The Vokera A08 fault code means: your boiler has detected an internal electrical safety failure and has shut down to prevent damage or unsafe operation.. It appears on 1 Vokera model in our database.
Technical description: Safety relay open when should be closed
What causes the Vokera A08 fault?
This fault occurs when the boiler's internal computer detects that a critical safety switch on the circuit board has failed to move into the correct position. The system shuts down immediately because it can no longer verify that the gas and ignition components are being controlled safely. The most common reason is that the electrical contacts on the main control board have worn out or become stuck over time.
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 A08 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A08 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