What does the Viessmann Vitodens 111-W F25 fault code mean?
The F25 fault code on the Viessmann Vitodens 111-W indicates a malfunction with the temperature sensor, which is crucial for monitoring and regulating the boiler’s temperature. This issue can lead to improper heating performance and may require immediate attention to ensure safe operation.
Common Causes
- Faulty Temperature Sensor: The sensor may be defective or damaged, leading to inaccurate temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the temperature sensor can disrupt its functionality, causing the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as working with gas appliances can be dangerous. Attempting to fix electrical components without proper training may lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the temperature sensor on a Viessmann Vitodens 111-W is approximately £150 to £200. This includes the cost of the part and labour, reflecting the complexity of the repair and the expertise required.