BoilerFaultCodesVokera E31 Fault Code
The Vokera E31 fault code means: your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water leaving the unit, preventing it from heating up safely.. It appears on 1 Vokera model in our database.
Technical description: Short circuit on flow sensor
What causes the Vokera E31 fault?
This fault occurs when the electrical connection inside the flow temperature sensor has failed, creating a short circuit that sends an incorrect signal to the boiler's control board. The most common reason is that the sensor's internal component has worn out over time or has been damaged by moisture, meaning the boiler can no longer safely monitor how hot the water is.
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 E31 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E31 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