What does the Baxi Duo-tec F36 fault code mean?
The F36 fault code on a Baxi Duo-tec boiler indicates a fault with the domestic hot water (DHW) sensor. This issue can prevent the boiler from heating water properly, leading to inadequate hot water supply.
Common Causes
- DHW Sensor Failure: The sensor may be malfunctioning or damaged, causing incorrect temperature readings.
- Wiring Issues: Damaged or loose wiring connections to the DHW sensor can disrupt its functionality.
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 the F36 fault, including a new DHW sensor and labour, is around £150 to £200. This cost reflects the price of the part and the typical labour charges for a qualified engineer.