What does the Viessmann Vitodens 100-W F59 fault code mean?
The F59 fault code indicates an issue with the pump speed in the Viessmann Vitodens 100-W boiler. This can lead to inadequate circulation of water, affecting heating efficiency and potentially causing further damage if not addressed.
Common Causes
- Faulty Pump: The pump may be malfunctioning or have internal wear, preventing it from operating at the correct speed.
- Electrical Issues: Problems with the wiring or control board can disrupt the signals sent to the pump, causing speed irregularities.
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 complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F59 fault could range from £150 to £300, depending on whether the pump needs replacement or if electrical components require servicing. This estimate includes parts and labour for a qualified engineer.