Why Does My Automatic Door Open and Close Repeatedly?

Automatic doors are essential for modern buildings, providing convenience, energy efficiency, and accessibility. However, one common issue reported by building managers and end users is that an automatic door opens and closes repeatedly without a clear reason.

As a professional automatic door sensor manufacturer, we aim to help our customers understand the root causes of this problem and offer effective solutions to ensure optimal door performance.

1. Common Causes of Repeated Opening and Closing

1.1 Sensor Detection Errors

The most frequent cause is a malfunction or misadjustment of the door’s activation sensor or safety sensor. If the sensor continuously detects motion or presence—even when no one is near the door—it will trigger repeated opening cycles. Typical reasons include:

Sensor sensitivity set too high

Dirt, dust, or condensation on the sensor lens

Misaligned sensor angle causing detection of unintended areas (e.g., swaying trees, passing vehicles, or reflective surfaces)

1.2 Environmental Interference

Environmental factors can also cause unexpected activations:

Strong sunlight or reflections may confuse infrared sensors.

Vibrations from nearby heavy machinery or traffic may trigger microwave sensors.

Moving objects such as display racks, plants, or signage near the detection zone can generate false signals.

1.3 Incorrect Installation or Positioning

Improper mounting height or incorrect orientation can lead to unnecessary door cycles. Each sensor type—infrared, microwave, or hybrid—has a specific installation guideline to ensure a defined detection area.

1.4 Electrical or Control System Faults

Occasionally, repeated opening and closing can result from issues within the door’s control unit or wiring. For example:

A damaged cable causing intermittent signals

Faulty relay contacts

Software malfunction in the controller

2. How to Troubleshoot Repeated Door Cycling

2.1 Inspect and Clean the Sensors

Check the sensor lenses for dust, spider webs, or water droplets. Clean them gently using a dry cloth.

Make sure the sensor covers are intact and free from cracks.

2.2 Adjust Sensor Sensitivity

Use the manufacturer’s recommended settings to adjust the detection range.

Ensure the sensor does not detect unnecessary areas such as nearby walls or ceiling reflections.

2.3 Check the Environment

Remove or relocate any movable objects near the door’s detection zone.

Ensure there are no highly reflective surfaces facing the sensor.

2.4 Verify Installation

Inspect the mounting position and alignment. Adjust the sensor angle according to the installation manual to focus detection only on the desired approach path.

2.5 Consult a Qualified Technician

If the issue persists after basic checks, contact a professional technician to inspect the control unit, wiring, and mechanical parts of the door system.

3. How High-Quality Sensors Prevent This Issue

At Qinuo Electronics Co., Ltd., we design and manufacture automatic door sensors with:

Advanced signal processing to minimize false detection

Adjustable sensitivity and detection area for precise control

Weather-resistant enclosures for stable performance in diverse conditions

Rigorous quality testing to ensure reliable operation

By choosing robust and intelligent sensors, building owners can significantly reduce the risk of unnecessary door cycling, lower energy loss, and prolong the lifespan of their automatic doors.

Conclusion

A door that opens and closes repeatedly often indicates sensor-related issues, environmental interferences, or installation faults. Regular inspection, proper sensor configuration, and high-quality equipment are essential for stable and reliable door performance.

If you experience persistent problems, we recommend consulting an authorized service provider or contacting our technical support team. As a trusted automatic door sensor manufacturer, we are committed to helping our partners and customers maintain safe, efficient, and smooth door operations.

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