What does the Viessmann Vitodens 050-W E340 fault code mean?
The E340 fault code indicates a malfunction with the system pressure sensor in the Viessmann Vitodens 050-W boiler. This issue can prevent the boiler from operating correctly, leading to heating and hot water supply problems.
Common Causes
- Faulty Pressure Sensor: The pressure sensor may be defective or damaged, causing inaccurate readings.
- Wiring Issues: Damaged or loose wiring connections to the pressure sensor can lead to communication failures with the boiler’s control unit.
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 or gas-related problems without proper training can lead to serious safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty pressure sensor in a Viessmann Vitodens 050-W is around £150 to £250. This includes the cost of the part and labour, as the sensor itself typically costs between £50 and £100.