Why Your Garage Door Won't Open — 7 Common Causes and How We Fix Them

A garage door that won't open is one of the most frustrating situations a Sydney homeowner can face — especially when your car is inside and you need to get somewhere. The good news is that most causes are diagnosable and fixable on the same day.

Here are the 7 most common reasons a garage door stops opening, what each one means, and what BounceBack GD does to fix it.

1. Broken Torsion or Extension Spring

This is the most common cause of a garage door that suddenly refuses to open. When a spring breaks, the door becomes too heavy for the motor to lift — you'll usually hear a loud bang when it happens, and the door will either not move at all or only lift a few centimetres.

What we do: Replace the broken spring (and inspect the second spring) in a single visit. Most spring repairs take 1-2 hours.

Can you open it manually? Yes — but the door will be very heavy. Use the red emergency release cord to disengage the motor first, then lift carefully with another person.

2. Faulty Garage Door Motor

If you press the remote or wall button and hear nothing — no humming, no clicking, no movement — the motor may have failed. Common motor faults include a burned-out capacitor, a failed logic board, or a tripped safety feature.

What we do: Diagnose the specific fault. In many cases the motor can be repaired rather than replaced — we carry common motor components including capacitors and logic boards for Merlin, ATA, B&D, Gliderol, and Superlift motors.

Check first: Make sure the motor is plugged in and the power outlet is working. Try resetting the motor by unplugging it for 30 seconds, then plugging it back in.

3. Snapped or Slack Cable

Garage door cables run from the bottom corners of the door up to the winding drums at the top. If a cable snaps or jumps off the drum, the door can jam, hang unevenly, or refuse to open entirely.

What we do: Replace the damaged cable and inspect the second cable. We also check the drums and spring tension to identify what caused the cable to fail.

Warning: Never operate a garage door with a visible snapped or frayed cable. The door can fall suddenly without warning.

4. Misaligned or Obstructed Safety Sensors

All automatic garage doors built after 1993 have safety sensors near the base of the door tracks. These sensors create an invisible beam — if anything interrupts the beam, the door won't close (and sometimes won't open). Misaligned sensors are one of the most common causes of a door that stops mid-cycle or reverses unexpectedly.

Signs your sensors are the problem: The wall button works but the remote doesn't, or the door opens but won't close.

What we do: Realign the sensors and clean the sensor lenses. This is usually a quick fix that takes 15-20 minutes.

Check first: Look at both sensor units near the base of the tracks — they should both show a solid light (usually green or amber). If one is blinking or off, the sensors are misaligned.

5. Dead Remote or Receiver Fault

If the wall button opens the door but the remote doesn't, the problem is with the remote or receiver — not the motor. Common causes include a flat battery, a remote that's lost its programming, a damaged antenna on the motor unit, or interference from nearby devices.

What we do: Diagnose whether the issue is the remote, the receiver, or interference.

We can reprogram existing remotes, replace remotes, or replace the receiver unit if needed.

Check first: Replace the remote battery. If it still doesn't work, try reprogramming the remote according to your motor's manual.

6. Door Off Its Tracks

A door that has come off its tracks will jam and refuse to open or close properly. This often happens after a vehicle accidentally makes contact with the door, after a cable snaps (which causes one side of the door to drop), or after years of wear on the rollers.

What we do: Carefully reset the door onto the tracks, inspect and replace any damaged rollers, and check the track alignment. We also identify and fix the underlying cause to prevent it happening again.

Warning: Don't try to force a door back onto its tracks yourself — the door can fall and cause serious injury.

7. Locked Garage Door

This sounds obvious, but it's surprisingly common — particularly with tilt doors and older manual doors that have a manual locking bar. If the door is in the locked position, the motor won't be able to open it and may trip its safety overload.

Check first: Look for a manual lock bar or slide bolt on the inside of the door. If it's engaged, disengage it and try again.

Still Not Sure What's Wrong? Call Us for a Same-Day Diagnosis

BounceBack GD provides same-day garage door repairs across all Sydney suburbs — Inner West, Eastern Suburbs, North Shore, Northern Beaches, Western Sydney, and everywhere in between. We're available 24 hours a day, 7 days a week for emergency callouts.

Call us on 02 9188 1552 or complete our online form and we'll get back to you promptly to confirm a time.