BoilerFaultCodesVokera E31 Fault Code
The Vokera E31 fault code means: your boiler has shut itself down as a safety precaution because it has detected a serious internal fault that could be related to combustion or basic operation.. It appears on 2 Vokera models in our database.
Technical description: The safety devices have been activated (lockout)
What causes the Vokera E31 fault?
This fault occurs when the boiler's internal safety sensors detect that the unit is operating outside of its safe temperature or combustion limits. It is typically triggered because the system has overheated or failed to ignite correctly, forcing the boiler to shut down to prevent damage. The most common reasons include a failing limit thermostat, a blocked heat exchanger, or an issue with the gas supply components.
This fault is more frequent during the first cold snap of autumn when boilers are switched back on after being idle, as internal mechanical parts like the gas valve can become stuck.
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 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 27 April 2026