Garage Door Reverses When Closing — Almost Always the Sensors
When a door starts down then bounces back up, the cause is almost always the photo-eye safety sensors at the bottom of the door tracks. Here's the 3-minute diagnostic — and the fix is usually free.
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Quick Answer: What to Do Right Now
✓ Try these safe checks first:
- Locate both photo-eye sensors at the bottom of each door track (~15cm above floor)
- Wipe both sensor lenses with a soft dry cloth — dust and cobwebs are #1 cause
- Check that both LEDs are solid (not flashing). One steady amber/red + one steady green = aligned
- Look for objects blocking the beam path between the two sensors
- Verify both sensors point at each other (gentle adjust by hand if not)
⚠ Call a professional immediately if:
- LEDs flash even after cleaning and re-alignment
- One or both sensors have no LED at all (no power)
- Wires from sensor to opener appear damaged or chewed
- Door reverses without any object in the path AND sensors look fine
- Travel-limit switches need adjustment (door isn't reaching floor)
What's Actually Causing the Reverse?
| Symptom | Likely Cause | Safe DIY Check | Call a Tech If... |
|---|---|---|---|
| Door reverses immediately as it starts closing | Photo-eye sensors misaligned or dirty | Clean lenses, ensure both LEDs are solid green/amber | LEDs flash after cleaning |
| Door closes most of the way, then reverses | Travel-limit switch set too low — opener thinks it hit an obstruction | Travel limits need professional adjustment | Door consistently stops 5–15cm above floor |
| Door reverses only in cold weather | Weather seal sticks to floor; opener reads as obstruction | Lubricate bottom seal with silicone spray | Lubrication doesn't fix it — seal may need replacing |
| Door closes from remote but reverses from wall button | Wall button programmed in "force lock" mode | Press and hold wall button until door fully closes | Behaviour continues — opener needs settings reset |
| Door reverses randomly throughout the day | Sensor wires intermittent or sensors loose | Wiggle wires gently; tighten sensor mounts | Wires are damaged, frayed, or chewed (pests) |
| Sensor LED is off entirely | No power — wiring break or sensor failure | Check fuse on opener; check wire path for breaks | Sensor needs replacement ($150–$220) |
Door reverses immediately as it starts closing
Door closes most of the way, then reverses
Door reverses only in cold weather
Door closes from remote but reverses from wall button
Door reverses randomly throughout the day
Sensor LED is off entirely
The 3-Minute Photo-Eye Fix
The vast majority of "door reverses when closing" calls turn out to be dirty or misaligned photo-eye sensors — a fix you can do yourself with a soft cloth in under 3 minutes. Wipe both sensor lenses, verify both LEDs are solid, and try closing the door again.
If the LEDs flash after cleaning, gently adjust each sensor by hand until both lights are steady. Most home insurance policies require working photo-eye sensors for garage door incident coverage, so don't be tempted to bypass them — see our garage door safety guide for the AS/NZS 4505 requirements.
If the issue isn't the sensors, the next most common cause is the travel-limit switches on the opener. If the door also won't close at all, or sticks halfway, the root cause is often the same.
Sensors look fine but still reversing?
Call 0461 410 198 — no call-out fee, typical sensor service or travel-limit adjustment under $250.
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If you're seeing crooked movement, loose cables, or a heavy door, it's safer to stop using it. Call us for garage door safety sensor repair in Sydney or request a callback in 2 minutes.