Doityourself has a wonderful explanation.
Sunlight messing with garage door sensor.
Chamberlain liftmaster craftsman garage door opener replacement safety sensors g801cb p includes 2 sensors mounting brackets and hardware 4 7 out of 5 stars 1 724 garage door opener liftmaster 41b873 saftey sensor sunblocker shield 41a5034.
Michael jan 30 18 at 4 45.
My door has this issue but even cleaning the glass on both sides after putting a solid cardboard piece in the way of direct sunlight so the sensor is always shaded the door still won t shut when the sun is at a certain angle in the sky.
How a garage door sensor works.
If there is a better sub let me know.
When the device detects any person or object in the path of a closing garage door it signals the motor to stop the downward action and switch the motion into reverse to stop the obstacle being crushed.
Knowing how a garage door sensor works allows a homeowner to be watchful for what might affect it.
If you are in a hurry and need to get your garage door closed right away stand in such a way that you cast a shadow over your garage door s beam sensor but of course don t block the beam itself just the sunlight that is shining on it and then press your remote control so that your door will close.
This video shows how to fold the cardboard shield around each sensor and re align the sensors.
This is a quick tip on shutting your garage door when sun is shining right on the sensor.
The replacement safety sensors project an invisible light beam across the inside of the garage door to prevent accidents and are required for safe use of all chamberlain garage door openers.
As soon as the door passes the sensors line the sunlight won t interfere with the beam anymore and the door will remain shut.
Sun messing with garage door sensors.
I ve tried putting toilet paper rolls around the sensors cleaning the eye emitter etc but if it s really bright even the glare off of the concrete breaks the beam.
The sun is preventing my garage door from closing.
Another thing you can do to overcome this problem permanently is to set a cylinder shaped object around each of the sensors eyes which will block the sunlight and prevent it from interfering with them.
I literally have.