BoilerFaultCodesVokera A03 Fault Code
The Vokera A03 fault code means: your boiler has detected that the internal fan responsible for safely exhausting fumes is not rotating correctly or reporting its speed, so it has shut down to keep you safe.. It appears on 3 Vokera models in our database.
Technical description: Fan tacho signal fault
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 A03 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera A03 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
- Vokera Compact A manual (PDF)
- Vokera Mynute i manual (PDF)
- Vokera Vision Combi 25C / 30C manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026