What does the Viessmann Vitodens 200-W F39 fault code mean?
The F39 fault code on the Viessmann Vitodens 200-W indicates a malfunction in the pressure sensor, which is crucial for monitoring the system’s water pressure. This issue can prevent the boiler from operating correctly, leading to heating and hot water supply problems.
Common Causes
- Blocked Pressure Sensor: Debris or scale buildup can obstruct the sensor, causing inaccurate readings.
- Electrical Fault: Issues with wiring or connections to the pressure sensor can lead to failure in sensor operation.
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 faults 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 200-W is around £150 to £250. This includes the cost of the part and labour, as pressure sensors are typically priced between £50 and £100, with additional charges for professional installation.