What does the Viessmann Vitodens 050-W E344 fault code mean?
The E344 fault code indicates a malfunction with the system supply sensor, which is responsible for monitoring the temperature of the water in the heating system. This issue can lead to improper heating performance and may require immediate attention to ensure efficient operation.
Common Causes
- Faulty Sensor: The sensor may be defective or damaged, leading to inaccurate temperature readings.
- Wiring Issues: Damaged or loose wiring connections can disrupt the signal between the sensor and the boiler control unit.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves electrical components and potential gas 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 replacing the system supply sensor is around £150 to £250, which includes the cost of the part and labour. This price reflects the typical cost of Viessmann parts and the expertise required for installation.