The activation of this (amber yellow) "warning" indicates that the engine coolant temperature is high.
It is activated when the temperature reaches 121C (250f).
Note
In this case, stop the vehicle and switch the engine off immediately; make sure that the fans are working.

Low hands free key (hf) battery level
Steering release error - steering still lockedDashboard system
The vehicle is equipped with two dashboards: an lcd (1) located on the
handlebar containing the key indications (speed,
rpm, engine coolant temperature, and clock) and a tft colour display (2) located
in the tank fairing displaying trip
information (riding style set, odometer, consumption, ave ...
Fuel tank
fuel tank
Rubber pad
Spacer
Screw
Hose
Tray
Y-fitting
Hose
Hose
Filler cap
Screw
Complete hose guide
Screw
Hose clip
Hose
Screw
Screw
Sealing washer
Screw
Flange
Sealing washer
Spare parts catalogue
Diavel abs fuel tank
Diavel abs fuel system
Diav ...
Refitting the expansion tank
If the support (15) has been removed, place the hose clamps (14) on the
bracket (15) orienting them as indicated.
Fully press the pins (a) to block the clamps (14) until pins surfaces (b) are at
the same level of the clamps (14) surfaces.
Apply recommended threadlocker to the thread of the ...