When the safety sensor is not properly aligned or something is obstructing the light beam the garage door will fail to close.
Liftmaster garage door safety sensor alignment.
Model cr2149 universal beam sensor the universal beam sensor works with all major brands of garage door openers chamberlain liftmaster craftsman overhead 1995 genie challenger stanley linear moore o matic and raynor models built by chamberlain.
Safety reversing sensors keep people and vehicles out of harm s way with liftmaster reversing sensors which detect an obstruction and reverses the gate to prevent an accident.
It operates on a low voltage beam which completed the switch when the door is in running condition.
The liftmaster garage.
Sometimes the sensor may be beyond repair due to wear and tear and in such a case your best bet is to replace the garage door sensor with a new one.
This is something to consider if you decide.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
For the door to close correctly without reversing the safety sensors need to be aligned perfectly and there should be nothing in the way of the light beam.
The latest garage door sensors are technologically advanced and even allow you to control the opening and closing through an app on your smartphone.
Most of the garage doors come with its display sensors that inform the user of the maintenance cycle.
This is a required safety device that must be connected and aligned correctly before the garage door opener will move in the down direction.
041a5034 is a safety reversing sensor replacement kit.
In this case you will set up the level aligned with one sensor then adjust the opposite sensor until the beam of your laser level is hitting the sensor.
If you have a laser level you can use it instead of a string to align your garage door.
These are located slightly above the ground on both the right and left sides of the garage doors.