What does the Viessmann Vitodens 050-W E355 fault code mean?
The E355 fault code indicates a problem with the heating circuit pump in the Viessmann Vitodens 050-W boiler. This typically means that the pump is either malfunctioning or has failed, preventing proper circulation of water in the heating system.
Common Causes
- Blocked Pump: Debris or sludge in the system can obstruct the pump, causing it to fail.
- Electrical Fault: Issues with the electrical connections or the pump’s motor can lead to a malfunction.
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 damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the heating circuit pump is around £300 to £450. This includes the cost of the pump and labour, as it requires professional installation to ensure safety and compliance with regulations.