Troubleshooting:
LED D15 through D17: Gate Open Input - LED ON indicates gate is being held open by auxiliary input (card reader, keypad, receiver, phone system, etc.).
LED D18: Auxiliary Input Indicator - LED ON indicates push button stuck or hold open switch on.
LED D19: Reversing Device Indicator - LED ON indicates safety device activated and holding gate open.
LED D22: Close Loop Indicator - LED ON indicates close loop has been activated.
LED D23: Back Loop Indicator - LED ON indicates back loop has been activated.
LED D24: Shadow Loop Indicator - LED ON indicates shadow loop has been activated.