BoilerFaultCodesVokera 42 Fault Code
The Vokera 42 fault code means: your boiler's internal sensor that measures water pressure is malfunctioning, preventing the system from safely starting up your heating or hot water.. It appears on 5 Vokera models in our database.
Technical description: pressure transducer fault
What causes the Vokera 42 fault?
This fault occurs when the boiler's internal computer receives an inconsistent or 'out-of-range' signal from one of its sensors. It is usually caused by a failing temperature sensor or a loose connection in the wiring harness that briefly interrupts the data flow. While the boiler may try to continue operating, it tracks these errors as a sign that a component is nearing the end of its life.
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 42 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 42 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