What does the Viessmann Vitodens 050-W E256 fault code mean?
The E256 fault code indicates a problem with the domestic hot water (DHW) sensor in the Viessmann Vitodens 050-W boiler. This sensor is responsible for monitoring the temperature of the water, and a fault can lead to issues with hot water supply.
Common Causes
- Faulty DHW Sensor: The sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the DHW sensor can cause communication problems with the boiler’s control system.
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 replacing a faulty DHW sensor is around £150 to £200. This includes the cost of the part and labour, as sensor replacements typically require professional installation.