What does the Viessmann Vitodens 222-F F45 fault code mean?
The F45 fault code on the Viessmann Vitodens 222-F indicates a problem with the diverter valve, which is responsible for directing hot water either to the heating system or to the hot water supply. This fault can prevent the boiler from functioning correctly, leading to issues with heating or hot water availability.
Common Causes
- Stuck Diverter Valve: The diverter valve may be stuck due to debris or mineral build-up, preventing it from moving freely.
- Electrical Fault: There may be an electrical issue, such as a faulty actuator or wiring problem, affecting the operation of the diverter valve.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working on gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the diverter valve on a Viessmann Vitodens 222-F is around £300. This includes parts and labour, as diverter valves can be complex and require professional installation.