BoilerFaultCodesVokera E24 Fault Code
The Vokera E24 fault code means: your boiler has shut itself down as a safety precaution because one of its internal safety sensors has detected a potential fault.. It appears on 1 Vokera model in our database.
Technical description: REFHI TOO HIGH ERROR Temperature measured not correct
What causes the Vokera E24 fault?
This fault occurs when the boiler's internal safety switches detect that the unit is operating outside of safe temperature or pressure limits, triggering an immediate shutdown to prevent damage. The most common reason is a failure in the safety thermostat or the flue sensor, which may be sending incorrect signals to the control board. It can also be caused by a communication error within the internal wiring or the main circuit board itself.
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 E24 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E24 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