Safety sensors — why a gate opens but will not close
This is the single most common automatic gate fault and one of the least expensive to fix. Photo-eyes sit either side of the opening and hold the gate open whenever the beam is broken. They are also, by design, paranoid: anything interrupting or misaligning that beam produces the same result as a genuine obstruction.
Common causes are a spider web across the lens, a bracket knocked by a vehicle or a mower, low winter sun striking the receiver directly, dust build-up, and a loose terminal in the wiring run. In most cases cleaning and realignment is the whole repair.
It is worth stressing that a gate refusing to close is the safety system working correctly. The fix is to remove what it is reacting to — never to bypass it.








