What does the Baxi Platinum F74 fault code mean?
The F74 fault code on a Baxi Platinum boiler indicates a problem with the domestic hot water (DHW) supply temperature. This typically means that the boiler is unable to achieve or maintain the desired temperature for hot water delivery.
Common Causes
- Faulty DHW Sensor: The sensor may be malfunctioning, leading to incorrect temperature readings.
- Blocked Heat Exchanger: A blockage in the heat exchanger can prevent efficient heat transfer, affecting water temperature.
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 handling for safety reasons.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F74 fault could be around £150 to £250, primarily depending on whether the DHW sensor needs replacement or if the heat exchanger requires cleaning or repair.