What does the Vaillant ecoTEC pro F97 fault code mean?
The F97 fault code on a Vaillant ecoTEC pro boiler indicates a problem with the system assessments, which may involve issues with the boiler’s internal diagnostics or sensor readings. This fault can prevent the boiler from operating efficiently or safely, requiring attention.
Common Causes
- Faulty Sensors: Malfunctioning temperature or pressure sensors can lead to incorrect readings, triggering the F97 fault code.
- Electrical Issues: Wiring problems or circuit board faults may disrupt communication between components, causing system assessment failures.
Can I fix it myself? (DIY)
It is recommended to call a Gas Safe Engineer for this fault, as it may involve complex electrical or gas-related issues that require professional expertise. Attempting DIY repairs could pose safety risks.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F97 fault could range from £150 to £300, depending on whether sensor replacements or circuit board repairs are needed. The cost reflects the complexity of diagnosing and fixing electronic components.