What does the Viessmann Vitodens 050-W E314 fault code mean?
The E314 fault code on the Viessmann Vitodens 050-W indicates a problem with the system’s expansion vessel, which is responsible for absorbing pressure fluctuations in the heating system. A faulty expansion vessel can lead to pressure issues, potentially causing the boiler to shut down to prevent damage.
Common Causes
- Insufficient Air Charge: The expansion vessel may have lost its air charge, reducing its ability to accommodate pressure changes.
- Physical Damage: The vessel could be damaged or corroded, leading to leaks and loss of functionality.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with the expansion vessel involves handling pressurised systems and could pose safety risks if not done correctly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the expansion vessel on a Viessmann Vitodens 050-W is around £200 to £300. This includes the cost of the part and labour, reflecting the complexity of the job and the need for a qualified technician.