What does the Vaillant ecoTEC plus F75 fault code mean?
The F75 fault code on the Vaillant ecoTEC plus indicates a problem with the system performance, often related to low water pressure or a fault in the heating system. This can prevent the boiler from operating efficiently, leading to heating issues.
Common Causes
- Low Water Pressure: Insufficient water pressure in the system can trigger the F75 fault, preventing proper circulation and heating.
- Blocked Filter or Pipe: A blockage in the system, such as a dirty filter or pipe, can restrict water flow and cause performance issues.
Can I fix it myself? (DIY)
If you are comfortable, you can check the pressure gauge on the boiler and attempt to refill the system if the pressure is low. However, for any gas or electrical issues, it is crucial to call a Gas Safe Engineer to ensure safety and compliance with regulations.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F75 fault could range from £100 to £250, depending on whether the issue is simply low pressure or requires more extensive work, such as clearing blockages or replacing components.