BoilerFaultCodesVokera E08 Fault Code
The Vokera E08 fault code means: your boiler's internal temperature sensors have developed a fault, meaning the system cannot safely monitor the water temperature and has shut down as a precaution.. It appears on 2 Vokera models in our database.
Technical description: Internal PCB fault
What causes the Vokera E08 fault?
This fault occurs when the boiler's internal temperature sensors stop providing a reliable reading to the control board. The most common reason is that the thermistor has physically degraded or developed an electrical short, though it can also be caused by loose wiring connections between the sensor and the main computer. Because the boiler no longer knows how hot the water is, it shuts down to prevent the unit from overheating.
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 E08 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E08 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 31 August 2026