What does the Viessmann Vitodens 222-F F27 fault code mean?
The F27 fault code indicates that the flue gas temperature is too low, which can lead to inefficient operation and potential safety issues. This fault typically suggests that the boiler is not reaching the required temperature for optimal combustion.
Common Causes
- Blocked Flue: A blockage in the flue system can prevent proper venting of exhaust gases, causing low temperature readings.
- Faulty Temperature Sensor: A malfunctioning flue gas temperature sensor may inaccurately report low temperatures, triggering the fault code.
Can I fix it myself? (DIY)
It is strongly advised to call a Gas Safe Engineer for any issues related to gas or electrical components. Attempting to fix these problems without proper training can be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F27 fault could range from £150 to £300, depending on whether the issue is a simple flue cleaning or requires replacement of the temperature sensor.