BoilerFaultCodesVokera AL52 Fault Code
The Vokera AL52 fault code means: your boiler has stopped working because of an internal communication error with its main brain, often caused by a failing circuit board.. It appears on 6 Vokera models in our database.
Technical description: Internal fault
What causes the Vokera AL52 fault?
This fault occurs when the boiler's internal computer chips stop talking to each other correctly. It is usually caused by electrical components on the main control board wearing out or becoming unstable due to age. In some cases, loose or damaged wiring between the internal sensors and the brain of the boiler can also trigger this specific error.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vokera models that show the AL52 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera AL52 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 31 August 2026