Stanley Automatic Sliding Door Not Closing...How To Fix It!

Stanley Access Technologies is one of the largest automatic door manufacturers in America. If you have walked through any popular grocery store chain or retail store chain, chances are you passed through a Stanley Automatic Sliding Door. One of the most frequently asked questions regarding these doors, is what do I do if my Stanley automatic sliding door does not close? In this article we answer this question so you can get your Stanley automatic sliding door back to working order.

1. Check the Interior and Exterior Motion Sensors

Most Stanley automatic sliding doors feature a microwave motion sensor as shown in the diagram below. The sensor has a light display on it. For Stanley automatic doors the light display should be illuminated when the motion sensor is not triggered. When a pedestrian approaches the door, the light will not be illuminated, indicating that the motion sensor has been triggered from the pedestrian. Look at both the exterior and interior motion sensors and verify that none of the motion sensors are triggering the door to stay open.

Exterior Motion Sensor Activation Triggers Door To Open

Stanley Motion Sensor

2. Check The Stanguard Threshold Sensor

Many Stanley automatic sliding door systems feature a Stanguard threshold sensor, a unique sensor specifically found only on Stanley automatic sliding doors. They are mounted overhead above the door opening. They function to keep the door open if pedestrians are in the doorway. The Stanguard has an illuminated light that you can see through the red acrylic lens. Check the Stanguard sensor to see if the door is being held open due to the Stanguard sensor.

Stanley Stanguard Threshold Sensor

3. Check The Safety Beam Sensors

Many Stanley automatic sliding doors feature hold open safety beams. These are recess mounted on the interior side of the left door stile and the interior side of the right door stile. The automatic door safety beam shines an infrared beam across the door way. They function to prevent the automatic door from closing on pedestrians while they are in the threshold area of the doors. Typically there is one safety beam set mounted low and one safety beam set mounted approximately at half of the door height. Check to make sure that nothing is blocking the path of the safety beam. Many times store owners tape flyers and promotions to their doors and sometimes they are not properly secured on the glass and block the safety beams keeping the door open.

Automatic Door Safety Beam Sensors

Automatic Door Safety Beam Set

4. Check The Hold Open Switch

Older Stanley automatic sliding doors used a black rocker switch for "Automatic, "Close, Hold Open." Make sure that the rocker switch is flipped to the "Automatic" position which allows the door to open when pedestrians approach the door from either the inside or outside. If your Stanley automatic sliding door is a newer model, then you will have the rotary switch. Be sure to make sure that the rotary switch is in the "Automatic" position and not the "Open" position.

Stanley Auto/Close/Open Rocker Switch

Stanley 6 Position Rotary Switch

5. Check The Breakout Switch

Stanley automatic door panels are designed to swing out in case of emergencies. If you have a full breakout automatic sliding door, all door panels are designed to swing out. If you have a fixed sidelite automatic sliding door, only the moving panels will swing out. Stanley automatic sliding doors are designed to not operate in the event any of the door panels are swung out. The best way to confirm that the doors are not swung out is to inspect each door leaf. Swing out each door leaf and firmly snap it back into place.

Full breakout Stanley automatic sliding doors utilize a magnetic breakout switch. The door has a magnet inside of the door panel, while a magnetic contact switch is inside of the door header. When the door swings out and the magnet is moved away from the switch, it sends a signal to the door controller to stop operating. If the door does not operate check to make sure the magnet is properly lined up with switch so that the door is not in the non-operational "breakout" mode.

Stanley Full Breakout Magnetic Breakout Switch
Stanley Magnet For Full Magnetic Breakout Switch

On fixed sidelite Stanley automatic sliding doors the breakout switch is a roller microswitch. The switch mechanism is recessed mounted into the fixed panel. The roller wheel is compressed against the moving panel. When the moving panel swings out, the wheel uncompresses causing the breakout microswitch to signal to the control that the moving panel has swung out and the door will not operate. It is very common for this type of breakout switch to wear down over time since the wheel is constantly pressing against the moving panel. Verify that your fixed panel breakout switch is operating correctly.

Stanley Fixed Sidelite Breakout Switch Assembly

These are the most common reasons your Stanley Automatic Sliding Doors are not closing. Always refer to the manufacturer's instruction manual for more troubleshooting recommendations and always make sure these adjustments are made by certified automatic door technicians. Of course if you have any questions at all feel free to contact us at and we would be happy to help you. If you need any replacement automatic sliding door parts for your Stanley automatic door you can purchase them at the link below. For any automatic door parts needs visit

Shop Automatic Sliding Door Parts For Stanley


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