Every wind storm that knocks out power in Richmond, Delta or the North Shore brings a run of the same call the next morning: the garage door opener is not working after the power outage. Sometimes the unit is completely dead. Sometimes it hums, or the light comes on but the door does not move. Sometimes it moves a few inches and stops. Each of those points to a different cause, and most of them you can clear yourself.
A garage door opener not working after power outage is usually fixed at the outlet or with a one minute unplug. Work through the list in this order. It goes from the cheapest, most common cause to the one that needs a technician, and each step rules out the one after it.
Garage door opener not working after power outage: start at the outlet
Garage outlets in BC are normally on a ground fault circuit, either a GFCI receptacle with its own reset button or a GFCI breaker in the panel. A surge when power returns trips them. Look at the ceiling outlet the opener plugs into; if it has a reset button, press it. If not, find the GFCI receptacle elsewhere in the garage or on an exterior wall, because one GFCI often protects every outlet downstream of it. Then check the panel for a tripped breaker, which sits in the middle position rather than fully on or off. Flip it fully off and then on.
Test the outlet with a phone charger or a lamp before you go further. If the outlet is dead and the breaker and GFCI are fine, the problem is electrical, not the opener.
2. Unplug the opener for a full minute
The opener's logic board is a small computer, and like any computer it can lock up when power flickers on and off several times in a row, which is exactly what happens as utility crews restore service. Unplug it from the ceiling outlet, count to sixty, and plug it back in. The light should come on and most units will click or run a short self check. There is no hidden reset button on LiftMaster or Chamberlain openers; the plug is the reset.
3. If it has a battery backup, look at the lights
Openers with a battery backup keep working through the outage, then should switch back to AC power when it returns. A unit that stays on battery after the power is back will run slowly, beep, and eventually stop when the battery drains. Unplug for a minute as above; most units recognise AC again within about fifteen seconds of being plugged back in. If the unit keeps showing the battery light or keeps beeping with power present, the AC side of the power supply has been damaged and the unit needs service. Our guide on a battery backup that is not working covers the battery itself, which also fails after a long outage if it was already old.
4. The door moves a little and stops, or will not close
If the opener runs but the door reverses, only opens part way, or closes a few inches and goes back up, the opener has not lost power; it has lost its settings or its sensors. Two things to check:
- Safety sensors. Both small lights at the bottom of the door tracks should be on steady. If one is off or flashing, the sensors were knocked during the outage (someone pulled the manual release and bumped them, or a car was pushed in by hand) or a surge got into the sensor wiring. Realign them so both lights are solid. Our sensor troubleshooting guide walks through it.
- Travel limits. Some older openers lose their learned open and close positions when power is cut, and the door then stops short or slams. Limits are reset with the adjustment buttons or screws on the motor unit, following the manual for that model. If you pulled the red emergency release during the outage, reconnect the trolley first: run the opener until the trolley reaches the carriage and clicks in, or pull the cord toward the door to relatch.
5. Remotes work but the wall button does not, or the reverse
If the wall control is dead but a remote works, the problem is the low voltage wall wiring or the button, not the outage itself. If remotes are dead but the wall button works, the opener's radio receiver took the hit, or the remotes simply need to be re-learned because the memory was cleared. Erase and reprogram them using the LEARN button; our remote programming guide has the steps by model. If the remotes will not learn at all, the receiver or board is damaged.
6. Nothing at all, with a good outlet: the board
A lightning strike or a hard surge when power returns can destroy the logic board or the power transformer inside the motor unit. The signs: the outlet is live, the unit has been unplugged and replugged, and there is no light, no click and no hum. On some units you will smell a burnt electrical smell at the motor head. The board can be replaced on most LiftMaster and Chamberlain units from the last fifteen years, and in most cases that is the right repair. If the unit is older, has a worn gear and sprocket, or parts are no longer made, a new opener is the better spend. We repair and replace openers across Metro Vancouver and will tell you which before we do anything.
Insurance and surge protection
If the opener died in a lightning storm, keep the dead unit and ask your home insurer; surge damage to a built in appliance is a claim some policies pay. For the future, a plug in surge protector rated for a motor load on the ceiling outlet costs little and takes the hit instead of the board. An opener with a battery backup also rides through short outages without rebooting, which avoids most of the problems on this page. If you are in a townhouse or strata, check who owns the opener before you buy anything: our strata responsibility guide explains who pays.
Getting in and out while it is dead
Pull the red cord to release the door from the opener and lift it by hand. If the door is heavy or will not stay up, the springs are weak and the door should not be used by hand until they are looked at. Full steps are in how to open a garage door manually during a power outage.
Frequently asked questions
Why is my garage door opener not working after a power outage?
For a garage door opener not working after power outage, the most common reasons, in order: a tripped GFCI outlet or breaker, a logic board that locked up and needs a one minute unplug, a battery backup unit that has not switched back to AC, lost travel limits, cleared remote memory, and a board damaged by a surge.
Is there a reset button on a LiftMaster or Chamberlain opener?
No. Unplugging the unit for a full minute is the reset. The LEARN button erases remotes; it does not reset the opener.
Can a power surge damage a garage door opener?
Yes. Surges when power is restored, and lightning in particular, can destroy the logic board or transformer. The board can be replaced on most units made in the last fifteen years.
How do I get my car out if the opener is dead?
Pull the red emergency release cord and lift the door by hand. If it is very heavy or will not stay open, stop and call; the springs are weak and the door can drop.
Do you fix openers in Richmond and Vancouver?
Yes. We repair and replace LiftMaster and Chamberlain openers across Metro Vancouver from our shop in Richmond. Call (778) 873-7282 to book a visit.