What does the Viessmann Vitodens 050-W E311 fault code mean?
The E311 fault code on the Viessmann Vitodens 050-W indicates a malfunction with the domestic hot water (DHW) pump. This issue can prevent the system from effectively circulating hot water, leading to inadequate hot water supply.
Common Causes
- Blocked or Clogged Pump: Debris or sediment may obstruct the pump, hindering its operation.
- Electrical Fault: Issues with the pump’s electrical connections or the control board can prevent the pump from receiving power.
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 safety risks. Attempting to fix it yourself could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the DHW pump is around £300 to £400. This includes the cost of the part and labour, as DHW pumps for this model can be expensive and require professional installation.