What does the Baxi Platinum F89 fault code mean?
The F89 fault code on a Baxi Platinum boiler indicates that the central heating (CH) supply temperature is too low, which can prevent the system from operating efficiently. This issue may lead to inadequate heating in your home.
Common Causes
- Low Water Pressure: Insufficient water pressure can result in inadequate flow through the system, causing low temperature readings.
- Faulty Temperature Sensor: A malfunctioning temperature sensor may incorrectly report low temperatures, triggering the fault code.
Can I fix it myself? (DIY)
If you suspect low water pressure, you can check the pressure gauge on your boiler and top up the system if necessary. However, for issues related to the temperature sensor or any gas/electrical components, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F89 fault code could be around £150 to £250, primarily depending on whether the issue is low water pressure or requires replacing a faulty temperature sensor.