If the Flashlight is not turning on when you perform an injection-
Please make sure the Mode of the flashlight is configured on the device by pressing the M (Mode) button:
Turn off the device and replace the communication cable.
Tighten the communication cable nut on the control unit and hand unit with pliers.
If the Flashlight still not turning on, the Led is probably broken, and you need to contact your pHi-Tech regional representative to let him know of the issue.