Chamberlain SectionalLift Plus Installation And Operating Instructions Manual page 13

TEST THE SAFETY REVERSE SYSTEM
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The safety reverse system test is important. Garage door must reverse on contact with a 40 mm
obstacle laid flat on the floor. Failure to properly adjust opener may result in serious personal injury
from a closing garage door. Repeat test once a month and adjust as needed.
Procedure: With door opened place a 40 mm obstacle (1) laid flat on the floor under the garage door. Operate the door in the
down direction. The door must reverse off the obstacle. If the door stops on the obstacle, remove obstacle and repeat Program the
Limits and Force Steps, then repeat safety reverse test.
When the door reverses off the 40 mm obstacle, remove the obstacle and run the opener through a complete travel cycle. Door
must not reverse in closed position. If it does, repeat Program the Limits and Force then repeat safety reverse test.
ADJUSTMENT SECTION
40 mm high
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1