Will a Garage Door Opener Work in a Power Outage?

Garage Door Opener Power Outage: Will It Work?

No. A standard opener will not run without power, and that includes the wall button, the keypad and every remote. The only exception is a model with a battery backup, which switches over automatically when the grid goes down.

LiftMaster, for example, says its battery-backup openers provide up to 24 hours of operation during an outage.^[3]

What many homeowners miss is that the outage disables the motor, not the door itself. Once the door is disconnected from the opener, you can lift it by hand.

That's the whole fix for most trapped-car situations.

Using the Release Cord During an Outage

Start with the door closed if you can. Pull the red release cord hanging from the opener rail, which disconnects the door from the trolley. Then lift the door manually, slowly and without straining.

Step by step

Releasing the door by hand

1. 1

   Start closed

   If you can, begin with the door closed.

2. 2

   Pull the cord

   Pull the red release cord to disconnect the door from the trolley.

3. 3

   Lift slowly

   Lift the door manually, without straining.

DASMA's safety guidelines note the door may move unexpectedly once disconnected, so keep your hands clear of the panel joints and stay out of its path.^[1]

Stop right there if the door feels extremely heavy, binds, or won't stay up. Garage door springs are under dangerous tension, and a broken spring can cause injury.^[2]

DASMA says not to operate the door with a broken spring and to leave repairs to a trained technician.^[1]

The cord is reachable only from inside the garage. If the car is trapped and there's no side entry door, don't force the door or try to fish for the cord.

That can damage the door or compromise your security, so call a garage door technician instead.

After the Car Is Out

Close the door by hand and make sure it's secured, since a disconnected door isn't being held by the opener. When power returns, reconnect the trolley following your opener's manual.

DASMA also advises reconnecting the door after closing it.^[1]

If the opener still won't respond once the lights are back on, check the breaker and confirm the unit is plugged in before assuming the motor failed. A storm can trip a breaker or loosen a connection.

If those check out and the opener is still dead, our guide to a garage door opener not working walks through remote, power and motor causes.

Battery Backup and Monsoon Outages

Monsoon season is when this problem shows up in the Valley. NOAA's Storm Events Database records a dust-storm event in the Phoenix area ending the evening of August 25, 2025.^[4]

Storms like that can disrupt power. A garage full of cars is a bad place to find out your opener has no plan B.

A battery backup keeps the opener working for a limited number of cycles, and the exact capacity depends on the manufacturer and model. Check your model's specifications rather than assuming it will run all night.

Batteries also wear out.

Phoenix summers reach 106°F, and heat is hard on any backup battery, so a unit that worked well before may not hold a charge now. Test it before monsoon season by unplugging the opener and running a cycle, then replace the battery if it struggles.

Pro tip

Test the backup before monsoon season by unplugging the opener and running a cycle.

If you're weighing an upgrade, or your current opener fails the test, a technician handling garage door opener repair can tell you whether to replace the battery, add backup or swap the unit.

Ask what the backup covers and how often it needs replacing.