What does the Viessmann Vitodens 050-W E347 fault code mean?
The E347 fault code indicates a malfunction in the heating circuit sensor of the Viessmann Vitodens 050-W boiler. This sensor is responsible for monitoring the temperature of the heating circuit, and a fault can lead to improper heating performance.
Common Causes
- Faulty Sensor: The heating circuit sensor may be defective or damaged, resulting in inaccurate temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality and cause the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential gas safety risks. Attempting to fix it yourself could lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the heating circuit sensor is around £150 to £200. This includes the cost of the part and labour, as sensor replacement typically requires professional expertise.