What does the Viessmann Vitodens 050-W E255 fault code mean?
The E255 fault code indicates a problem with the outdoor sensor of the Viessmann Vitodens 050-W boiler. This sensor is crucial for measuring the outdoor temperature, which helps the boiler adjust its operation for optimal efficiency.
Common Causes
- Faulty Outdoor Sensor: The sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections between the sensor and the boiler can disrupt communication and cause the fault code to appear.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer to diagnose and repair this issue, as it involves electrical components and safety concerns. Attempting to fix it yourself may void warranties or lead to further complications.
Estimated Repair Cost (2026 UK Prices)
The estimated cost for replacing the outdoor sensor is around £150 to £200, including parts and labour. This price reflects the typical cost of the sensor and the expertise required for installation.