What does the Viessmann Vitodens 050-W E221 fault code mean?
The E221 fault code on the Viessmann Vitodens 050-W indicates a malfunction in the domestic hot water (DHW) pump. 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 pump’s electrical connections or the control board may lead to a failure in pump operation.
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 a faulty DHW pump on a Viessmann Vitodens 050-W is around £300 to £400. This includes the cost of the pump and labour, reflecting the complexity of the repair and the need for a qualified technician.