What does the Baxi Duo-tec F27 fault code mean?
The F27 fault code on a Baxi Duo-tec boiler indicates a problem with the water temperature sensor. This sensor is crucial for monitoring the temperature of the water in the system, and a fault can lead to inefficient heating or system shutdown.
Common Causes
- Faulty Water Temperature Sensor: The sensor may be malfunctioning or damaged, leading to incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the sensor can disrupt its functionality, causing the fault code to appear.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer to diagnose and repair this issue, as it involves gas and electrical components that can be dangerous if handled improperly.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for fixing the F27 fault code is around £150 to £250. This includes the cost of a replacement water temperature sensor and labour, as the sensor itself typically costs between £50 and £100.