why does my garage door close then open

The garage door opener limit switch tells the motor that lifts and lowers the garage door when to stop running. Incorrectly set limit switches may prevent your garage door from closing completely or opening all the way. They can also cause the opener to reverse or pull back up when you attempt to close it, which can seem like a malfunction or that someone else is using a garage door opener remote that is on the same frequency as yours. This is actually caused by a safety mechanism meant to protect people from being hit and having the door close on them. Resetting the limit switch will stop your garage door from behaving erratically.
Note : If the door is not closing, check the garage door opener for sensor indicators before setting travel limits. For Example; Does the garage door opener motor unit, click or the main lights flash 10 times?. Limit adjustment settings regulate the points at which the door will stop when moving up or down. After adjusting the limit settings,Pcheck the Safety Reversal System and Test the Protector System.


Manual travel and force adjustments arePadjusted using a flathead screw driver. To operate the opener, press the door control push bar. Run the opener through a complete travel cycle. Does the door open or close completely? Does the door stay closed and not reverse unintentionally when fully closed? If your door passes both of these tests, no limit adjustments are necessary unless the reversing test fails. Adjustment procedures are outlined below. Run the opener through a complete travel cycle after each adjustment. If the door does not open completely but opens at least five feet (1. 5 m): Increase up travel. Turn the UP limit adjustment screw clockwise. One turn equals 2 (5 cm) of travel. NOTE: To prevent the trolley from hitting the cover protection bolt, keep a minimum distance of 2-4 (5 cm - 10 cm) between the trolley and the bolt. If door does not open at least 5 feet (1. 5 m): Adjust the UP (open) force as explained in Adjustment Step 2.


Increase down travel. Turn the DOWN limit adjustment screw counterclockwise. One turn equals 2 (5 cm) of travel. If door still won t close completely and the trolley bumps into the pulley bracket, try lengthening the door arm (page 18 in your installation manual) and decreasing the down limit. Decrease down travel. Turn the DOWN limit adjustment screw clockwise. One turn equals 2 (5 cm) of travel. If the opener lights are flashing, the Safety Reversing Sensors are either not installed, misaligned, or obstructed. See page 27 in your installation manual. Test the door for binding: Pull the emergency release handle. Manually open and close the door. If the door is binding or unbalanced, call for a trained door systems technician. If the door is balanced and not binding, adjust the DOWN (close) force. See Adjustment Step 2. Grasp the door bottom when the door is about halfway through DOWN (close) travel. The door should reverse. Reversal halfway through down travel does not guarantee reversal on a 1-1/2 (3. 8 cm) obstruction.


See Adjustment Step 3, page 30 in your installation manual. If the door is hard to hold or doesn t reverse, DECREASE the DOWN (close) force by turning the control counterclockwise. Make small adjustments until the door reverses normally. After each adjustment, run the opener through a complete cycle. If the door reverses during the down (close) cycle and the opener lights aren t flashing, INCREASE DOWN (close) force by turning the control clockwise. Make small adjustments until the door completes a close cycle. After each adjustment, run the opener through a complete travel cycle. Do not increase the force beyond the minimum amount required to close the door. Grasp the door bottom when the door is about halfway through UP (open) travel. The door should stop. If the door is hard to hold or doesn t stop, DECREASE UP (open) force by turning the control counterclockwise. Make small adjustments until the door stops easily and opens fully.


After each adjustment, run the opener through a complete travel cycle. If the door doesn t open at least 5 feet (1. 5 m), INCREASE UP (open) force by turning the control clockwise. Make small adjustments until door opens completely. Readjust the UP limit if necessary. After each adjustment, run the opener through a complete travel cycle. Open the door. Place the garage door opener carton in the path of the door. Press the remote control push button to close the door. The door will not move more than an inch (2. 5 cm), and the garage door opener lights will flash 10 times. The garage door opener will not close from a remote control if the LED in either safety reversing sensor is off (alerting you to the fact that the sensor is misaligned or obstructed). If the garage door opener closes the door when the safety reversing sensor is obstructed (and the sensors are no more than 6 inches [15 cm] above the floor), call for a trained door systems technician.

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