What does the Viessmann Vitodens 050-W E356 fault code mean?
The E356 fault code indicates a problem with the domestic hot water (DHW) pump in the Viessmann Vitodens 050-W boiler. This issue can prevent the boiler from effectively circulating hot water, leading to inadequate hot water supply.
Common Causes
- Blocked DHW Pump: Debris or scale buildup can obstruct the pump, preventing it from functioning properly.
- Electrical Fault: Issues with the wiring or connections to the DHW pump can lead to a failure in operation.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for any repairs related to the DHW pump, as this involves gas and electrical components that require professional handling for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty DHW pump on a Viessmann Vitodens 050-W is approximately £300 to £400. This includes parts and labour, as the pump replacement requires professional installation to ensure proper function and safety.