What does the Viessmann Vitodens 111-W F58 fault code mean?
The F58 fault code on the Viessmann Vitodens 111-W indicates a problem with the domestic hot water (DHW) control system. This can affect the boiler’s ability to heat water effectively, leading to insufficient hot water supply.
Common Causes
- Faulty DHW Sensor: A malfunctioning sensor may not accurately detect water temperature, causing control issues.
- Wiring Issues: Damaged or loose wiring connections can disrupt communication between components, leading to control faults.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and 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 resolving the F58 fault could be around £150 to £300, depending on whether a sensor replacement or wiring repair is needed. This cost reflects the complexity of diagnosing and fixing control system issues.