Once you know that the lock button is not the issue you ll want to check to see if anything is obstructing the sensors or if the sensors need to be realigned.
Garage door will not go down light flashes.
You push the button to close the garage door.
Many times the malfunction can be due to a loose connection or broken wire.
If your garage door opener won t open and the motor unit lights blink 10 times it usually means you have a problem with your safety sensors.
When the safety sensor is not properly aligned or something is obstructing the light beam the garage door will fail to close.
First check the sensor lights.
Check if something is blocking the way of the safety sensor.
Check if the safe t beams red led light is flashing.
Sweep the garage floors and look through the sidings to ensure that there are no objects to obstruct the door.
If you push the garage door opener switch when the sensors are obstructed or not aligned properly your garage door will reverse and the lights will blink 10 times.
Since the lack of power supply is a common problem check the wires around the sensor when the led lights are not flashing.
If the door goes up but you can t make it go down you probably need to adjust the sensors.
Adjust the limits as needed.
This is almost always the result of a dirty or obstructed safety feature.
Eliminate any item in between the sensors.
Make sure only the safe t beams that came with this garage door opener are installed.
It goes partway down reverses direction and goes back up again.
In this video from sears partsdirect we ll show you some simple fixes like checking the garage door opener s alignment and clearing obstructions.
If your garage door opener is still blinking try realigning the safety reversing sensors.
There is one on each side of the door.
They both have lights and both lights should be on.
To troubleshoot your liftmaster safety sensors.
The liftmaster garage door opener lights will flash for ten times.
Pressing wall mount it closes.
The garage door will.
If the operator s light bulb isn t flashing once door reversed release the door to manual mode while it s fully closed raise and lower it by hand to check for any obstructions and that the door is correctly balanced.
If it is a new installation check the postion of the door arm.
Garage door starts down then stops and goes back up or safe t beam system malfunction.
Check if the limits are properly set.