What does the Vaillant ecoTEC plus F22 fault code mean?
The F22 fault code indicates a low water pressure issue or a dry fire condition in the Vaillant ecoTEC plus boiler. This typically means that the system is unable to operate safely due to insufficient water pressure.
Common Causes
- Low Water Pressure: This can occur due to leaks in the system, bleeding radiators, or insufficient filling of the boiler.
- Dry Fire Condition: This may happen if the boiler has been running without sufficient water, potentially due to a malfunctioning pressure sensor or pump.
Can I fix it myself? (DIY)
You can attempt to fix the low pressure issue by checking the pressure gauge on the boiler and re-pressurising the system if it is below 1 bar. If the problem persists or if you suspect a more serious issue, 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 £250, depending on whether it requires a simple re-pressurisation or more complex repairs such as replacing a faulty pressure sensor or fixing leaks.