Final answer:
A FAULT light (accompanied with an ECAM caution message) on the WING pushbutton indicates an issue with either the PROBE/WINDOW or ANTI ICE PANEL.
Step-by-step explanation:
On the WING pushbutton, a FAULT light (accompanied with an ECAM caution message) indicates an issue with either the PROBE/WINDOW or ANTI ICE PANEL.
The FAULT light might be caused by a malfunctioning probe, window, or anti-ice system on the wing of an aircraft.
This could result in inaccurate or unavailable data from the affected system, potentially affecting the flight performance and safety of the aircraft.