To do that look for a step ladder and verify that the wires from the sensors are correctly connected to the garage door opener.
How to adjust chamberlain garage door sensors.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
If your garage door sensors are outside of this range remove them entirely from the garage door frame and install leveled inside the safe zone.
Higher than that can miss many low lying objects including pets.
After inspecting your safety sensors and the leds on both the sending and receiving sensor is off check if safety sensors are correctly installed on the chamberlain garage door opener.
Although many openers are self adjusting there are ways to tinker with the travel and level the limit so the control works properly.
From informational videos to product manuals and troubleshooting articles the chamberlain group resource library has the information you need.
Chamberlain garage door simple sensor diagnose and fix.
Lower is easy to stand above with a foot on either side.
Find the chamberlain garage door opener technical support you need to get your garage door opener operational.
How to adjust garage door opener sensors diy note.
When the invisible beam path is obstructed or misaligned while the door is closing the door will rev.
On the garage door motor there will be two knobs or dials to adjust the opener and the reverse sensor.