What does the Vaillant ecoTEC plus F73 fault code mean?
The F73 fault code on a Vaillant ecoTEC plus boiler indicates a faulty system notification, often related to issues with the boiler’s internal components or sensors. This code typically suggests that the boiler has detected a malfunction that requires attention.
Common Causes
- Faulty Sensor: A malfunctioning temperature or pressure sensor can trigger the F73 fault code, leading to incorrect readings and system notifications.
- Electrical Issues: Problems with the boiler’s wiring or connections may cause communication failures between components, resulting in the F73 error.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this issue, as it may involve complex electrical or gas components that require professional expertise. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for addressing the F73 fault code is around £150 to £250, depending on whether a sensor replacement or electrical repair is needed. This cost reflects the typical labour and parts required for such repairs.