LiftMaster 8500W Owners Manual - Page 21

Adjustment 2 Test the Safety Reversal System TEST 1. With the door fully open, place a 1-1/2 inch (3.8 cm) board (or a 2x4 laid flat) on the floor, centered under the garage door. 2. Press the remote control push button to close the door. The door MUST reverse when it makes contact with the board. ADJUST If the door stops but does not reverse: 1. Review the installation instructions provided to insure all steps were followed; 2. Repeat Program the Travel (see Adjustment Step 1); 3. Repeat the Safety Reversal test. If the test continues to fail, call a trained door systems technician. IMPORTANT SAFETY CHECK: Test the Safety Reverse System after: • Each adjustment of limits. • Any repair to or adjustment of the door (including springs and hardware). • Any repair to or buckling of the floor. • Any repair to or adjustment of the garage door opener. 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. • 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. 1-1/2" (3.8 cm) board (or a 2x4 laid flat) 3 Test the Protector System 1. Open the door. Place an obstruction in the path of the door. 2. 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. Without a properly installed safety reversing sensor, persons (particularly small children) could be SERIOUSLY INJURED or KILLED by a closing garage door. Safety Reversing Sensor Safety Reversing Sensor 21