What does the Viessmann Vitodens 111-W F22 fault code mean?
The F22 fault code on the Viessmann Vitodens 111-W indicates a dry fire condition or low water pressure within the system. This can prevent the boiler from operating efficiently and may lead to further issues if not addressed promptly.
Common Causes
- Low Water Pressure: Insufficient water pressure in the system can trigger the F22 fault, often due to leaks or insufficient filling.
- Dry Fire Condition: This occurs when the boiler attempts to operate without adequate water, potentially due to a malfunctioning pressure sensor or valve.
Can I fix it myself? (DIY)
If the issue is low water pressure, you can attempt to repressurise the system by using the filling loop. However, if the problem persists or involves gas or electrical components, 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 range around £150 to £250, primarily depending on whether a pressure sensor needs replacement or if the system requires a thorough inspection for leaks.