Automatic gates are designed to fail open, not closed, because a gate that can't be opened traps cars and blocks emergency access. That's good engineering, but it means the most common gate complaint we get is simply: it won't close.
Start with the safety devices. Photo-eyes and safety loops tell the operator when something is in the path of the gate. A photo-eye knocked out of alignment, blocked by a spider web, or fogged by morning humidity will keep the gate open all day. Wipe the lenses and check that the indicator lights are solid, not blinking.
Next, check power and the battery backup. A tripped breaker, a failed transformer, or a dead backup battery after a storm will leave the operator without enough power to close. Many operators also have a timer-to-close setting that gets accidentally turned off; if the gate opens fine but never closes on its own, that's the first setting we look at.
Look at the gate hardware. A sliding gate with a bent track, worn rollers or a chain that's stretched will stall partway. A swing gate with a sagging hinge post will bind. If the operator strains and reverses, it thinks it hit an obstruction, and that's often just friction from hardware that needs adjustment.
Finally, the operator itself. Motors, gearboxes, control boards and limit switches wear out, especially on high-traffic community gates. If the basics check out and the gate still won't close, it's time for a technician. We repair and replace operators from LiftMaster and other major brands, with up to a two-year warranty, and we offer maintenance plans that catch most of this before residents notice.