If you find that your gate opens perfectly fine and doesn't close, this could be why. On your main control board there is an NC light that should be on at all times (see image B below). If this light isn't on then the control board thinks there is an obstruction within the gate way area and will not allow the gate to close.

There should be a small loop wire (see image C) between COM and NC on the control board. If the loop wire is there then just tighten up both screws. However, if the loop wire is missing, just add a small piece of wire/cable between COM and NC. Once the screws are tightened up, the NC light should come on. Now activate the gate with an accessory to check that the gate will close.

If you have a solar unit, the battery power will travel throught the D14 Diode (top left corner of control board) and feeds power to the main control board. To check if the diode has failed, create a bridge (as shown in the image below) from one side of the diode to the other. Making sure that you have a good connection, try activating the gate with either a remote or visitor accessory. Does the gate operate?

If yes, great! Secure that piece of cable in place and run the unit as is for a few weeks. If everything is still operational after this time, then you can go ahead and replace the diode with either a 6amp or 10amp.

If no, then you can either call the office for further assistance or try further troubleshooting here.