Liftmaster motors will not operate when something obstructs the infrared beam between the safety sensors at the bottom of the garage door tracks.
Garage door opener light flashes 10 times.
Tweak them a bit.
There are a few things which can cause this.
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Garage door won t close light flashes.
The safety sensors use an invisible beam of infrared light to detect obstructions in the garage door s path.
Anytime the main light flashes 10 times and the door reverses to the open position it is telling you there is something wrong with the door sensors.
Safety sensor kit part number 41a5034.
Garage door openers made after 1993 are equipped with sensors positioned on both sides of the vertical rails.
Defective safety sensors or faulty sensor wiring also cause the opener lights to blink 10 times.
Perhaps the most common issue for many homeowners if the safety sensors are not properly aligned the light will blink 10 times.
The blinking opener lights indicate that the safety sensors are likely blocked or out of alignment.
Replacing the safety sensors on a garage door opener.
If one of the leds is not on the door sensors need to be replaced.
Look up parts for your model.
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.
If this is not the issue then your sensors will probably need to be aligned.
Look at the led s on both door sensors.
With the diagnostic feature on craftsman you can know what exactly the issue is.
This most likely indicates that the garage door sensors are out of alignment or there is something in the way of the sensors.
An open door will not close if the infrared beam is broken.
The table below shows how to identify the issue with the diagnostic.
If one or both leds is blinking the sensors are misaligned.
If you notice this happen start by seeing if anything is obstructing the sensors field of view.
If you cannot get both lights to come on you have bad sensors.
The main light will blink 10 times indicating a problem.
When the garage door does not close and the lights flashes it means the problem is with the safety sensor.
To fix this issue first locate the two photo eyes attached to your garage door and clean the lens using a soft microfiber cloth.
The led on the motor will also blink and serves as a diagnostic tool for troubleshooting.
Make sure they are pointed at one another and the small light on each one is lit and not flickering.
The light from the opener blinks 10 times to warn you about misaligned photo eyes.
