What does the Viessmann Vitodens 222-F F43 fault code mean?
The F43 fault code on the Viessmann Vitodens 222-F indicates a malfunction in the heating circuit sensor. This sensor is responsible for monitoring the temperature of the heating water, and its failure can disrupt the boiler’s operation.
Common Causes
- Faulty Sensor: The heating circuit sensor may be defective or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can cause communication failures 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.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing a faulty heating circuit sensor on a Viessmann Vitodens 222-F is approximately £150 to £250. This includes the cost of the sensor and labour, reflecting the complexity of the repair and the expertise required.