Garage Door Opener Not Working? 7 Causes and How to Fix Them

Your Opener Won't Respond — Start Here

You're late for work, you press the remote, nothing happens. Or the opener hums but the door doesn't move. Before you call anyone, there are a few quick things to check. This guide walks you through the 7 most common causes of garage door opener failure — from the simple fixes you can do yourself to the problems that need a professional.

1. Dead Remote Battery

It sounds obvious, but it's the most common cause. Try the wall button inside your garage. If the door works from the wall button but not the remote, you just need a new battery. Most remotes use standard CR2032 or AA batteries, available at any drugstore.

2. Opener Is Unplugged or Circuit Breaker Tripped

Check that the opener unit is plugged into the outlet on your ceiling. Then check your home's electrical panel — a tripped breaker will cut power to the entire garage circuit. Reset the breaker and try again.

3. Safety Sensors Are Misaligned or Dirty

Garage door openers installed after 1993 are required to have safety sensors — two small devices near the floor on either side of the door. If they're misaligned, blocked, or have a dirty lens, the opener won't close the door.

Look for the small LED lights on each sensor. Both should be lit solid (usually one green, one amber). If one is blinking or off, gently realign the sensors so they point directly at each other, and wipe the lenses with a clean cloth.

4. Opener Remote Needs to Be Reprogrammed

If you recently had a power outage or replaced the opener's battery backup, the remote may have lost its programming. Refer to your opener's manual (LiftMaster, Chamberlain, Genie all have YouTube tutorials) or call us — reprogramming takes about 5 minutes.

5. Broken Spring or Cable

If your opener hums or strains but the door barely moves or doesn't move at all, the motor is likely trying to lift a door with a broken spring or snapped cable. The opener is not designed to lift the full weight of the door without spring assistance.

In this case, stop using the opener immediately. Forcing it can burn out the motor. This requires a professional repair — see our article on broken springs above.

6. Worn Drive Gear or Stripped Gear

You hear the opener running but nothing moves, and there's a grinding noise? The plastic drive gear inside the opener may be worn or stripped. This is a common failure point on older LiftMaster and Chamberlain units, especially those 10+ years old. A technician can replace just the gear for much less than a full opener replacement.

7. The Opener Has Reached End of Life

Garage door openers typically last 10 to 15 years. If yours is older, has had multiple repairs, and still isn't reliable — it may be time to replace it. Modern openers offer WiFi connectivity, battery backup (critical during Washington power outages), and much quieter belt-drive operation.

Comfort Line installs and services all major brands: LiftMaster, Chamberlain, Genie, Craftsman, and more.

When to Call a Professional

Call us if:

• The door moves unevenly or one side is lower than the other

• You hear grinding, scraping, or popping sounds

• The opener runs but the door doesn't move (possible broken spring or gear)

• The door reverses immediately after touching the ground

• Any visible damage to springs, cables, or tracks

📞 Opener giving you trouble? Comfort Line serves Lynnwood, Everett, Shoreline, Mukilteo & Greater Seattle. Call (425) 327-8765 for same-day diagnostics. Free estimate!