What does the Vaillant ecoTEC plus F58 fault code mean?
The F58 fault code on a Vaillant ecoTEC plus boiler indicates a problem with the system pressure relief, which may be due to excessive pressure in the system or a malfunctioning pressure relief valve. This can lead to safety concerns and requires immediate attention to prevent further damage.
Common Causes
- Excessive System Pressure: If the boiler’s pressure exceeds the recommended level, it can trigger the F58 fault code.
- Faulty Pressure Relief Valve: A malfunctioning or blocked pressure relief valve may fail to release excess pressure, causing the fault to appear.
Can I fix it myself? (DIY)
While you can check the system pressure and attempt to reset the boiler, it is strongly advised to call a Gas Safe Engineer for any repairs related to gas or electrical components to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F58 fault could range from £150 to £250, depending on whether the issue is simply a pressure adjustment or if a new pressure relief valve is required, which can be more expensive.