What does the Viessmann Vitodens 050-W E209 fault code mean?
The E209 fault code indicates a malfunction with the supply temperature sensor in the Viessmann Vitodens 050-W boiler. This sensor is crucial for monitoring the temperature of the water being supplied to the heating system.
Common Causes
- Sensor Failure: The supply temperature sensor may have failed due to wear and tear or manufacturing defects.
- Wiring Issues: Damaged or loose wiring connections to the sensor can lead to incorrect readings and trigger the fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components and safety risks associated with gas appliances.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the supply temperature sensor is around £150 to £200, which includes the cost of the part and labour. This is based on typical service rates and the price of the sensor itself.