BoilerFaultCodesViessmann E14 Fault Code
The Viessmann E14 fault code means: your boiler has stopped working because it cannot communicate with the sensor that monitors the temperature of your hot water cylinder.. It appears on 1 Viessmann model in our database.
Technical description: Burner does not start. Cylinder sensor fault (short circuit or lead break).
What causes the Viessmann E14 fault?
This fault occurs when the boiler loses its electrical connection to the probe that monitors your hot water tank’s temperature. The most common reason is that the internal wiring has become damaged, or the sensor itself has suffered an electrical failure, meaning the boiler can no longer tell if your water is hot or cold. As a safety precaution, the system stops the burner from firing to prevent the water from 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 →Viessmann models that show the E14 fault code
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Source
Viessmann E14 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026