What does the Vaillant ecoTEC exclusive F22 fault code mean?
The F22 fault code indicates a low water pressure issue or a dry fire condition in the boiler. This typically means that the system is unable to detect sufficient water pressure to operate safely.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system or insufficient water supply, leading to inadequate pressure for the boiler to function.
- Air in the System: Trapped air can prevent water from circulating properly, causing the boiler to overheat and trigger the F22 fault code.
Can I fix it myself? (DIY)
You can attempt to fix low water pressure by checking the pressure gauge and using the filling loop to add water to the system if necessary. However, if the issue persists or if you suspect a gas or electrical fault, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F22 fault code is around £150 to £200, primarily for a service call and potential replacement of components like pressure relief valves or filling loops, depending on the specific cause of the fault.