An automatic gate that opens normally but will not close is usually responding to something intended to prevent closing. A blocked photo eye is common, but it is not the only possible cause. Safety edges, vehicle loops, access-control inputs, timer settings and mechanical resistance can create the same symptom.
What the symptom tells you
Because the gate has already opened, the operator has demonstrated that it has at least some power and can move the gate. The next step is to identify what is holding the close command or causing the operator to believe that a person, vehicle or object is in the gate’s path.
Safe checks you can make
- Move every vehicle away from the gate opening and from any marked loop area.
- Remove trash cans, branches and other objects from the travel path.
- Wipe accessible photo-eye lenses with a soft cloth and clear vegetation, spider webs, mud and insects from the beam path.
- Look for an obviously loose, damaged or misaligned sensor without opening its wiring compartment.
- Note any flashing LED or displayed diagnostic code before resetting anything.
- Record whether the problem occurs only during rain, bright sun or a particular time of day.
Safety: Never bypass, jumper or disconnect a required photo eye, safety edge or monitored entrapment-protection input to force the gate to close.
When to call KDI
Call when the gate still will not close after the path and sensors are clear, when it reverses repeatedly, or when a safety device or its wiring appears damaged. KDI services automatic gates throughout Charleston and the South Carolina Lowcountry. Request automatic gate service or call (843) 730-0215.
Reviewed September 22, 2026. Procedures and diagnostic codes vary by operator model and production generation; use the manual for the exact equipment installed.