A03Vokera
Vokera A03: fan tacho signal fault
Checked against Vokera's own documentation: Vokera Vision combi user, installation and servicing instructions and 1 more source. Last reviewed October 2026. How we check
Check these first, then call an engineer
The boiler isn't getting the expected speed signal from its fan. Vokera's manuals list a reset first, then a fan check.
What you can safely do
- Reset the boiler once and check it runs normally.
Call a Gas Safe engineer if
- A03 comes back. The fan needs checking by an engineer.
Find a Gas Safe engineer near you
Opens the official Gas Safe Register search.
Applies to Vision and Compact A. Codes can differ between models, so check your manual.