What does the Baxi 600 Series F22 fault code mean?
The F22 fault code on the Baxi 600 Series indicates a dry fire condition or low water pressure in the system. This typically means that the boiler is unable to detect sufficient water flow, which can lead to overheating and potential damage.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water supply, preventing the boiler from operating correctly.
- Air in the System: Trapped air can cause blockages, leading to a lack of water flow and triggering the F22 fault code.
Can I fix it myself? (DIY)
You can attempt to fix the low pressure by checking the pressure gauge on the boiler and using the filling loop to add water if the pressure is below 1 bar. However, if you suspect air in the system or other gas/electrical issues, it is essential to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F22 fault could be around £150 to £200, primarily for a pressure relief valve replacement or system bleeding. This cost reflects the need for a qualified engineer’s time and expertise.