What does the Viessmann Vitodens 200-W F43 fault code mean?
The F43 fault code on the Viessmann Vitodens 200-W indicates a malfunction in the circulation pump. This can lead to inadequate water flow, affecting the boiler’s heating efficiency and overall performance.
Common Causes
- Blocked Pump: Debris or scale buildup can obstruct the pump, preventing it from functioning properly.
- Electrical Fault: Issues with the pump’s electrical connections or control board 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 pump, as handling gas and electrical components can be dangerous. Attempting to fix it yourself may void warranties or lead to further issues.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for a faulty pump on a Viessmann Vitodens 200-W is around £300 to £450. This includes parts and labour, as the pump itself can cost approximately £200, with additional charges for installation and diagnostics.