What does the Viessmann Vitodens 200-W F33 fault code mean?
The F33 fault code on the Viessmann Vitodens 200-W indicates a malfunction with the hot water sensor, which is responsible for monitoring the temperature of the water. This issue can lead to improper heating and affect the overall performance of the boiler.
Common Causes
- Faulty Hot Water Sensor: The sensor may be damaged or malfunctioning, leading to inaccurate temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality and cause the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair the issue, as working with gas appliances can be dangerous and requires professional expertise.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for replacing the hot water sensor on a Viessmann Vitodens 200-W is approximately £150 to £200. This includes the cost of the part and labour, as sensor replacements typically require professional installation.