BoilerFaultCodesVokera E15 Fault Code
The Vokera E15 fault code means: your boiler has shut itself down for safety because a central control unit or an internal monitoring device has detected a serious fault.. It appears on 2 Vokera models in our database.
Technical description: The safety devices have been activated (lockout)
What causes the Vokera E15 fault?
This fault occurs when the boiler's internal safety checks detect a major communication failure or a critical error within the electronic control system. It is usually triggered when the main circuit board can no longer safely manage the heating process, causing the unit to shut down instantly to prevent damage. The most common reasons are a malfunctioning main PCB or a fault in the wiring harness that connects the boiler's various sensors.
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 E15 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E15 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