BoilerFaultCodesVokera Test3 Fault Code
Also written as TEST3 — same fault.
The Vokera Test3 fault code means: your boiler has identified an issue with the air fan, preventing it from safely clearing away exhaust gases and starting the ignition process.. It appears on 1 Vokera model in our database.
Technical description: Fan fault
What causes the Vokera Test3 fault?
This fault occurs when the boiler's internal computer detects that the fan is not spinning at the correct speed or has failed to start entirely. The most common reason is mechanical wear and tear within the fan motor, though it can also be caused by a communication failure between the fan and the main control board.
This fault is slightly more frequent in winter, as the fan has to work harder and more consistently to meet higher heating demands, which can cause aging components to finally fail.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Vokera models that show the Test3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Test3 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