BoilerFaultCodesVokera LD3 Fault Code
The Vokera LD3 fault code means: your boiler is currently running a self-diagnostic test or is in a temporary programming mode indicated by a yellow flashing light.. It appears on 1 Vokera model in our database.
Technical description: Led analysis test (blink yellow)
What causes the Vokera LD3 fault?
This code appears when the boiler’s control dial is moved into a specific position, triggering a self-test or setup mode. It usually happens if the dial has been accidentally moved past its normal settings or if the control knob is loose, causing the internal switch to sit between two functions. It is a temporary status rather than a mechanical failure of the internal components.
DIY fix possible
Wait 10-15 minutes for the light to stop flashing automaticallyEnsure the mode selector dial is set to 'Hot Water' or 'Heating and Hot Water' rather than the 'Reset' positionRotate the selector dial to 'Reset' for 5 seconds and then back to your desired setting
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Gas Safe Register →Vokera models that show the LD3 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera LD3 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