What does the Viessmann Vitodens 050-W E249 fault code mean?
The E249 fault code indicates a problem with the water quality sensor in the Viessmann Vitodens 050-W boiler. This sensor is responsible for monitoring the quality of the water circulating in the system, and a fault may lead to inefficient operation or potential damage.
Common Causes
- Sensor Malfunction: The water quality sensor may be defective or damaged, leading to inaccurate readings.
- Contaminated Water: High levels of impurities or contaminants in the water can cause the sensor to trigger a fault code.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working with gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the water quality sensor is around £150 to £250, including parts and labour. This cost reflects the complexity of the repair and the need for a qualified technician to ensure safety and compliance with regulations.