BoilerFaultCodesVokera Test1 Fault Code
Also written as TEST1 — same fault.
The Vokera Test1 fault code means: your boiler appears to have no power and is completely unresponsive to any commands.. It appears on 1 Vokera model in our database.
Technical description: No display, boiler inactive
What causes the Vokera Test1 fault?
This fault occurs when the boiler's electronic brain loses its power supply or suffers a total electrical failure. It is most commonly caused by a blown internal fuse or a capacitor failure on the main circuit board, which prevents electricity from reaching the display and controls. In some cases, it can also be triggered by a faulty connection between the user interface and the main component board.
This issue often occurs following summer storms or power surges, though it is also common during the first cold snap of winter when the components are suddenly put under increased electrical load.
DIY fix possible
Check if other appliances in the house are working to rule out a power cutCheck your main consumer unit (fuse box) to see if a circuit has trippedEnsure the boiler's fused spur switch is turned on and the fuse inside has not blown
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Gas Safe Register →Vokera models that show the Test1 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Test1 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