Diagnosis
The turn signal module (integrated into the display/control unit) has likely lost its internal connection or the software has glitched.
How to Fix It
Perform a full system reset. Turn the scooter on, then hold the power button and the brake lever for 15 seconds until the display turns off and back on. Test the signals immediately after.
If That Didn't Work
The physical button for the signals on the left handlebar control may be faulty or have debris under it. Inspect the button for physical damage.
Heads Up
The turn signals are not user-serviceable components. If a reset doesn't work, you'll need a warranty replacement of the control unit—Apollo is aware of this fault.