BoilerFaultCodesVokera Test 1A Fault Code
Also written as TEST1A — same fault.
The Vokera Test 1A fault code means: your boiler has lost its display and controls, which usually means the main internal circuit board has failed while the pump is stuck in a backup safety mode.. It appears on 2 Vokera models in our database.
Technical description: No display, pump running
What causes the Vokera Test 1A fault?
This issue occurs when the boiler's central brain, the printed circuit board, suffers a critical electronics failure or loses power entirely. It is usually caused by an internal electrical short or a worn-out component on the board that prevents it from communicating with the display. Because the control board can no longer manage the system, the pump stays running as a built-in safety measure to prevent the unit from overheating.
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 Test 1A fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Test 1A 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