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3
1-1/2" (3.8 cm) board
(or a 2x4 laid flat)
Without a properly installed safety reversal system, persons
(particularly small children) could be SERIOUSLY INJURED or
KILLED by a closing garage door.
• Safety reversal system MUST be tested every month.
• If one control (force or travel limits) is adjusted, the other
control may also need adjustment.
• After ANY adjustments are made, the safety reversal system
MUST be tested. Door must reverse on contact with 1-1/2"
(3.8 cm) high object (or 2x4 laid flat) on the floor.
Testing the Safety Reverse System
Conduct the Safety Reverse Test After:
• Each adjustment of door arm length, force or limit controls.
• Any repair to or adjustment of the garage door (including
springs and hardware).
• Any repair to or buckling of the garage floor.
• Any repair or adjustment to the opener.
Procedure:
• With the door fully open, place a 1-1/2" (3.8 cm) board
(or a 2x4 laid flat) on the floor, centered under the garage
door.
• Operate the door in the down direction. The door must reverse
on striking the obstruction.
Adjust:
• If the door stops on the obstruction, it is not traveling far
enough in the down direction. Refer to “When to Adjust the
Limits” on page 2.
NOTE: On a sectional door, when fully closed, the door arm
must not go beyond a straight up and down position. If so,
lengthen door arm.
• Repeat the test.
• When the door reverses on the 1-1/2" (3.8 cm) board, remove
the obstruction and run the opener through 3 or 4 complete
travel cycles to test adjustment.
If the door will not reverse after repeated attempts, call for a
trained door systems technician.
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