What does the Baxi Platinum F73 fault code mean?
The F73 fault code on a Baxi Platinum boiler indicates a problem with the central heating (CH) return temperature, suggesting that the return water temperature is either too low or not being detected correctly. This can lead to inefficient heating and potential damage if not addressed promptly.
Common Causes
- Blocked Heat Exchanger: A build-up of debris or limescale can restrict water flow, causing incorrect temperature readings.
- Faulty Temperature Sensor: If the sensor that measures the return temperature is malfunctioning, it may send inaccurate data to the boiler’s control system.
Can I fix it myself? (DIY)
While some basic checks can be performed, such as ensuring the system is properly filled and the pressure is correct, it is strongly advised to call a Gas Safe Engineer for any gas or electrical issues to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F73 fault could range from £150 to £300, depending on whether the issue is a simple sensor replacement or requires cleaning the heat exchanger, which is more labour-intensive.