By kenneth crawford troubleshooting a liftmaster opener with a flashing light involves inspection of the safety reverse sensing system.
Garage door opener flashing yellow light.
Garage door opener light blinks led light blinking indicates a problem note.
An open door will not close if the infrared beam is broken.
Button or wall panel push button is flashing.
The led light that is referred to in this article is the small light that is located on the opener near the adjustment learn or program buttons.
Liftmaster motors will not operate when something obstructs the infrared beam between the safety sensors at the bottom of the garage door tracks.
Chamberlain garage door openers with yellow or blue force adjustment dials flash the led next to the learn button to indicate a component failure.
If you do not see a solid illumination or your garage door is not working the problem is most likely due to the sensors being out of line.
Find the chamberlain garage door opener technical support you need to get your garage door opener operational.
If the opener cannot detect that the safety sensors are properly working or connected then the opener lights will flash and the door will refuse to close.
The constantly flashing wall button simply means that the door was either put into lock out mode by someone using the wall panel control or for some reason it defaulted into lock.
The garage door opener flashing wall button is completely different from photo cell led light being out or the motor head led light flashing.
The chamberlain liftmaster craftsman garage door opener wall buttons will flash when the opener is placed in lock out mode.
If you see that the sender sensor is not yellow and the receiver sensor is not green then this means that your sensors are probably off.
You ll need to first equip yourself with a wrench of some sort and a tape measure.
You will need to use a ladder to access this area.
From informational videos to product manuals and troubleshooting articles the chamberlain group resource library has the information you need.
The garage door sensor yellow light and the green light together create a solid illumination.