What does the Vaillant ecoTEC pro E119 fault code mean?
The E119 fault code indicates that the boiler is experiencing low water pressure, which can prevent it from operating efficiently. This issue can lead to heating and hot water supply problems if not addressed promptly.
Common Causes
- Low Pressure in the System: This can occur due to leaks in the heating system or radiators, causing a drop in water pressure.
- Faulty Pressure Relief Valve: If the pressure relief valve is malfunctioning, it may not maintain the correct pressure in the system, leading to low pressure readings.
Can I fix it myself? (DIY)
You can attempt to fix low water pressure by checking the pressure gauge on your boiler. If it is below 1 bar, you can use the filling loop to add water to the system until it reaches the recommended pressure (between 1-1.5 bar). However, if you suspect a leak or other serious issues, it is crucial to call a Gas Safe Engineer.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing low water pressure issues, such as replacing a faulty pressure relief valve, is around £150-£250. This cost includes parts and labour, reflecting the complexity of diagnosing and fixing the underlying cause.