Garage Door Opener Light Blinking: What It Means and What to Check

When the light on your garage door opener starts blinking, it is usually not a burned out bulb. Most modern openers use their lights to send a message. The trick is figuring out which light is blinking and what it is trying to say.

Which light is blinking?

There are usually three places to look.

• The main work light. This is the bulb or light panel on the motor unit that lights up the garage. On many openers, this light flashes when the door refuses to close.
• A small indicator light on the motor unit. Often near the learn button or on the back or side of the unit. It may blink in a pattern.
• The light on the wall button. Many wall controls have a small light that changes when lock mode is on.

Note which one is blinking, how many times, and when it happens. That makes the rest of this easier.

The most common cause: the safety sensors

The safety sensors are the two small units near the floor on each side of the door. One sends an invisible beam and the other receives it. If the beam is broken, the opener won't close the door, and on many openers the work light flashes to tell you why.

Check these things first:

• Blocked beam. Look for a bin, a bike, a leaf, a cobweb or anything else between the sensors.
• Dirty lenses. Wipe both lenses gently with a soft, dry cloth.
• Misaligned sensors. Each sensor usually has a small indicator light. If one is off or flickering, the pair may have been bumped out of line. Many sensors can be gently turned by hand until the lights stay steady. Your manual explains what the lights should look like.
• Sunlight. Strong sun shining straight into a sensor can confuse it, often at the same time each day.
• Wiring. Look for a loose, chewed or pinched wire running to the sensors.

Our step by step guide on how to test your garage door safety sensors covers this in more detail, and garage door won't close? 6 common causes explains related issues.

Check the lock or vacation mode

Many wall controls have a lock feature that blocks remotes and keypads. On some openers, the wall button light blinks while lock is on. If your remotes stopped working and the wall button is blinking, check the wall control and your manual for how to turn lock off. Our post on a remote or keypad that isn't working goes through the other checks.

Blinking in a pattern

Some openers flash a light a set number of times, pause, and repeat. That pattern is a code. The meaning depends on the brand and model, so there is no single chart that fits every opener.

• Count the flashes and note any pause in between.
• Look up your model in the owner's manual or on the manufacturer's website.
• The code usually points to a category, like a sensor problem, a wiring issue or something inside the opener.

The model number is usually on a label on the motor unit. Take a photo of it so you have it when you need it.

Other reasons a light might blink

• Programming mode. When you press the learn button, an indicator light often turns on or blinks while the opener waits for a remote. It should stop on its own.
• After a power outage. Some openers flash or behave oddly after power comes back. Unplugging the opener for a minute and plugging it back in can help. Our power outage guide covers the manual release.
• A safety reverse. If the door started down, reversed and the light is flashing, something may have triggered the auto-reverse. See why a garage door starts to close, then reverses.

What not to do

Don't bypass or tape over the safety sensors to make the door close. They are there to stop the door from closing on a person, a child or a pet. Don't adjust the opener's force or travel settings either. If the door is reversing or refusing to close, raising the force can stop it from reversing when something really is in the way.

When to call a professional

Call for service if the sensors are clean and lined up but the light keeps blinking, if the flash pattern points to an internal problem, if wiring looks damaged, or if the door hesitates, strains or reverses for no clear reason. An opener that is getting older may be worth a look too. See repair or replace your garage door opener.