BoilerFaultCodesVokera E 31 Fault Code
Also written as E31 — same fault.
The Vokera E 31 fault code means: your boiler has detected an electrical fault in the part that measures the temperature of the water being sent to your radiators, which prevents it from heating properly.. It appears on 1 Vokera model in our database.
Technical description: Short circuit on flow sensor
What causes the Vokera E 31 fault?
This fault occurs when the boiler's internal sensor responsible for tracking the temperature of the water leaving the unit fails electrically. It is usually caused by the sensor's internal wiring failing over time or moisture getting into the electrical connections, which prevents the boiler from safely knowing how hot the water is. Because the system can no longer regulate its heat output, it shuts down to prevent 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 E 31 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E 31 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