What does the Viessmann Vitodens 222-F F22 fault code mean?
The F22 fault code on the Viessmann Vitodens 222-F indicates a dry fire condition or low water pressure within the system. This typically means that the boiler is unable to detect sufficient water flow, which can lead to overheating and potential damage if not addressed promptly.
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 prevent proper water circulation, leading to a dry fire condition.
Can I fix it myself? (DIY)
You can attempt to fix low water pressure by checking the pressure gauge and re-pressurising the system if it is below 1 bar. If the issue persists or if you suspect air in the system, it is strongly advised to call a Gas Safe Engineer for further diagnosis and repair.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F22 fault could range from £150 to £300, depending on whether it involves simply re-pressurising the system or if more extensive repairs are needed, such as fixing leaks or bleeding radiators.