What does the Baxi Duo-tec F73 fault code mean?
The F73 fault code on a Baxi Duo-tec boiler indicates a problem with the domestic hot water (DHW) control system. This typically means that the boiler is unable to properly regulate the temperature or flow of hot water.
Common Causes
- Faulty DHW sensor: The sensor may be malfunctioning, leading to incorrect temperature readings and control issues.
- Wiring issues: Damaged or loose wiring connections can disrupt communication between the control board and the DHW components.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it involves gas and electrical components that require professional expertise. Attempting DIY repairs could be dangerous.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F73 fault could be around £150 to £250, primarily depending on whether the DHW sensor needs replacing or if wiring repairs are necessary.