When your gate opens normally but won't close, the problem is almost always related to safety sensors. Here's how to identify and resolve the issue.
Most Common Cause: Photo Eye Obstruction
Photo eyes prevent the gate from closing when something blocks the beam:
- Check for objects in sensor path
- Look for spider webs on sensors
- Clear debris or vegetation
- Clean sensor lenses
Second Common Cause: Misaligned Photo Eyes
Sensors must point directly at each other:
- Check LED indicator lights
- Steady light = aligned
- Blinking or no light = misaligned
- Adjust until alignment restored
Other Possible Causes
Wiring Issues
- Damaged wires from lawn equipment
- Rodent damage to wiring
- Loose connections at sensors
- Corroded terminals
Sensor Failure
- Water damage from sprinklers
- Sun damage over time
- Physical impact damage
Control Board Issues
- Failed sensor input on board
- Power surge damage
- Loose connections at board
Troubleshooting Steps
- Visually inspect sensor path
- Clean both sensor lenses
- Check alignment LEDs
- Inspect wiring for damage
- Test with temporary wire bypass (carefully)
Important Safety Note
Never permanently bypass safety sensors. They protect against serious injury. If sensors are malfunctioning, have them repaired or replaced.
Temporary Workaround
Most operators have a "hold to close" feature:
- Hold close button continuously
- Gate closes while button held
- Use only until repairs are made
Professional Diagnosis
If troubleshooting doesn't resolve the issue, Standard Gate Co can diagnose and repair the problem. Call (323) 488-GATE for same-day service.