Gate doesn't move at all. Be sure actuator connector is securely seated in the gate control board. Check for damaged actuator cable. Replace gate control board. Unplug connector before gate goes open too far to avoid blowing the fuse. .
Gate moves only a few feet, then stops.
Check for gate binding or obstruction. Check for bent actuator screw. Replace gate control board. . Gate surges too much when moving. Check for movement in pivot arm when gate is moving.