What does the Vaillant ecoFIT pure F22 fault code mean?
The F22 fault code on a Vaillant ecoFIT pure boiler indicates a dry fire condition or low water pressure within the system. This typically means that the boiler is unable to operate safely due to insufficient water flow or pressure.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system, insufficient water supply, or a faulty pressure relief valve.
- Dry Fire Condition: This may happen if the boiler is running without adequate water, often caused by a malfunctioning pump or blockages in the system.
Can I fix it myself? (DIY)
You can attempt to resolve low pressure by checking the pressure gauge and re-pressurising the system if it is below 1 bar. However, if the issue persists or if you suspect a more serious fault, it is crucial to call a Gas Safe Engineer for assistance.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F22 fault could range from £150 to £300, depending on whether it requires a simple pressure adjustment or more complex repairs like replacing a pump or fixing leaks.