Check that the dipswitches are as below pictures (for exit gates).
Example: The left gate is the gate on your left side when you walk through the gates in correct direction. 

If the gates are being used as entrance gates, dipswitch 4 needs to be to the left (normal) instead of right (SCO).

Additional video

Recommended spare part

- If the Main PCB itself is faulty, below spare part can be ordered.