BoilerFaultCodesVokera AL74 Fault Code
The Vokera AL74 fault code means: your boiler is struggling to move water through your heating system, which means it has stopped heating your home to prevent itself from overheating.. It appears on 6 Vokera models in our database.
Technical description: No water circulation
What causes the Vokera AL74 fault?
This fault occurs when the boiler's internal sensors detect that heated water isn't moving away from the heat exchanger quickly enough. The most common reasons are a mechanical failure of the circulation pump, a build-up of sludge blocking the pipes, or a faulty sensor providing incorrect temperature readings. To prevent the unit from overheating, the system shuts down as a safety precaution.
This issue often surfaces when the heating is first turned on after summer, as the pump can seize up after long periods of inactivity.
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 AL74 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera AL74 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