BoilerFaultCodesVokera AL52 Fault Code
The Vokera AL52 fault code means: your boiler's internal computer has encountered a memory or software error and can no longer control the heating properly.. 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 control center suffers a critical failure in its internal memory or software processing. It is essentially a terminal logic error where the circuit board can no longer safely calculate how much gas or heat to provide. The most common reason is age-related degradation of the electronic components, which causes them to lose their pre-programmed settings.
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 7 July 2026