What does the Viessmann Vitodens 100-W F73 fault code mean?
The F73 fault code on the Viessmann Vitodens 100-W indicates a problem with the energy monitoring system, which may affect the boiler’s efficiency and operation. This fault typically suggests that the boiler is unable to accurately measure energy consumption or output, leading to potential performance issues.
Common Causes
- Faulty Energy Meter: The energy meter may be malfunctioning or damaged, preventing accurate readings.
- Wiring Issues: Loose or damaged wiring connections related to the energy monitoring system can lead to communication errors.
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 complications or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F73 fault could range from £150 to £300, primarily depending on whether the energy meter needs replacement or if wiring repairs are necessary. This estimate includes parts and labour costs typical for professional service.