What does the Vaillant ecoTEC plus F98 fault code mean?
The F98 fault code on the Vaillant ecoTEC plus indicates a problem with the system standards, often related to the boiler’s internal sensors or communication issues. This fault can prevent the boiler from operating correctly, leading to heating and hot water failures.
Common Causes
- Faulty Temperature Sensor: A malfunctioning temperature sensor can cause incorrect readings, triggering the F98 fault code.
- Wiring Issues: Damaged or loose wiring connections within the boiler can disrupt communication between components, leading to this fault.
Can I fix it myself? (DIY)
It is advisable to call a Gas Safe Engineer for this issue, as it involves electrical components and safety risks. Attempting to fix it without proper training could lead to further damage or safety hazards.
Estimated Repair Cost (2026 UK Prices)
The estimated repair cost for resolving the F98 fault code is around £150 to £250, primarily due to the potential need for replacing sensors or repairing wiring. This cost reflects the complexity of diagnosing and fixing electrical issues in modern boilers.