BoilerFaultCodesVokera E042 Fault Code
The Vokera E042 fault code means: your boiler has lost the ability to measure the water pressure accurately, which has caused it to stop running for safety.. It appears on 4 Vokera models in our database.
Technical description: Water transducer fault
What causes the Vokera E042 fault?
This fault occurs when the internal sensor responsible for monitoring water pressure fails to send a reliable signal to the main control board. The most common cause is a component failure within the transducer itself or a loose connection in the wiring harness. Because the boiler cannot verify if there is enough water to operate safely, it shuts down to prevent internal overheating.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the E042 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E042 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