What does the Vaillant ecoTEC pro F22 fault code mean?
The F22 fault code on a Vaillant ecoTEC pro 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, or if the pressure has not been adequately maintained.
- Blocked or Faulty Pressure Sensor: A malfunctioning pressure sensor may incorrectly report low pressure, preventing the boiler from firing up.
Can I fix it myself? (DIY)
You can attempt to resolve the issue by checking the pressure gauge on your boiler. If the pressure is below 1 bar, you can top it up using the filling loop. However, 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 code is approximately £150 to £250. This includes potential costs for topping up the system and replacing a faulty pressure sensor if necessary.