Garage Door Won't Close? 5 Things to Check Before You Call a Technician

"It opens fine but it won't close"

This is one of the most common service calls we get. The good news is that more than half the time it is something you can fix yourself in five minutes. Work through this checklist before you book a callout.

1. Check the safety beams

Every modern automatic garage door has a pair of safety beams (sometimes called photo eyes) about 15cm above the floor on either side of the opening. They look like small black plastic eyes pointing at each other. If anything breaks the beam — a leaf, a kid's toy, a spider web, the dog's lead — the door will refuse to close.

• Look for an obstruction across the opening at floor level.
• Wipe the lenses with a soft cloth — Toowoomba dust and spider webs are the number one cause.
• Check the small LED on each beam. On most brands, both should be solid (not flashing). A flashing or off LED means the beams are misaligned or unpowered.
• Gently push each bracket — if you can move it with one finger, it's been bumped out of alignment. Loosen the wing nut, line them up, retighten.

If both lights go solid and the door closes, you are done.

2. Check the lock or vacation switch

Many openers have a "lock" or "vacation" mode that disables the wireless remotes. It's designed for when you are away on holiday, but it gets bumped on accidentally all the time.

• Look at the wall control unit inside the garage.
• Find the small "lock" or "vacation" button — it's usually labelled.
• Make sure the LED next to it is off.

3. Check the trolley arm and chain

If you can hear the motor running but the door is not moving, the trolley (the part that connects the chain to the door) may have come disconnected from the chain.

• Look up at the rail. The chain should be tight along the rail with the trolley in the middle.
• If the trolley is sitting at one end, it has come off the chain or the chain has slipped a sprocket. This needs a technician.

4. Check for an off-track door

If the door looks crooked, has dropped on one side, or the rollers are out of the vertical track, do not try to close it. Trying to force a misaligned door makes the damage worse.

• Visible gap on one side at the top.
• Roller hanging out of the track.
• Door pinched mid-travel.
• Bent track section near the curve.

This is a callout — not a DIY fix. Tension is still in the springs and the cables can whip when the door moves.

5. Check the wall power and back-up battery

A surprising number of "won't close" calls are simply a tripped circuit breaker or a flat back-up battery on a smart opener pretending to be on mains.

• Open your meter box and check the breaker labelled garage or shed.
• Check the LED on the opener motor — if it is off entirely, no power.
• If you have a Merlin MyQ, B&D smart opener or ATA Smart Hub with battery back-up, the battery typically needs replacing every 3–5 years. A flat battery in back-up mode often makes the door behave erratically.

When to call us

• Limit switch adjustment ($150–$220 callout) — the opener thinks the door is already closed.
• Force setting recalibration ($150–$220) — the opener detects "resistance" too early.
• New safety beams ($220–$320 fitted) — old beams can fail electrically.
• Spring or cable repair ($350–$850) — if the door is unbalanced.
• Off-track repair ($280–$450+) — if the door is misaligned.

A free tip from years of doing this

If your safety beams keep getting knocked out of alignment, ask us to retrofit a small bracket guard. It costs almost nothing on a service visit and saves you the next "won't close" panic.

Local team you can call

We are 7am–7pm seven days a week, and we live in Toowoomba. Most fixes are sorted in a single visit.

A quick word on safety beams in Toowoomba conditions

Safety beams (the small electronic eyes 15cm above the floor on each side) are responsible for about 60% of "won't close" service calls. The good news is that 80% of those are fixed in 30 seconds. The bad news is that local conditions make beams misbehave more here than in most parts of Australia:

• Spider webs. Toowoomba has a healthy population of small black house spiders that love the warm beam housings. A single web across the lens stops the beam.
• Dust. If your driveway is gravel or you live near a paddock, fine dust coats the lenses within weeks.
• Sun glare. Late afternoon western sun coming through an open garage can wash out the receiver beam.
• Bumped brackets. Reversing trailers, kids' bikes and ride-on mowers all knock beams out of alignment.

Wipe the lenses every six months as a habit. It takes 10 seconds.

Diagnostic LEDs by brand

Knowing what the lights mean saves a callout:

• B&D Controll-A-Door — green LED on the wall control means power good. Red flashing 1× usually means safety beam misalignment. Red flashing 2× usually means force fault. Three or more flashes usually means an internal motor fault.
• Merlin MyQ — purple LED on the motor head solid is normal. Flashing yellow usually means safety beam blocked. Solid yellow with no movement usually means force learning needed.
• ATA GDO — solid red on the wall control is normal. Slow flashing red usually means safety beam fault. Fast flashing red usually means force overload.

Bring or quote us the flash code and we can pre-diagnose the issue on the phone.

Things you can check yourself in five minutes

1. Check no obstruction (toy, leaf, plant) is across the safety beam line.
2. Wipe both safety beam lenses with a soft dry cloth.
3. Check the wall control "lock" or "vacation" button is off.
4. Try a different remote to rule out a dead remote battery.
5. Check the circuit breaker for the garage in the meter box.
6. Look up at the chain — is it tight or hanging loose?
7. Look at the door — is it sitting straight in the opening?

If those don't fix it, we're a phone call away.

Local repair costs in 2026

• Limit switch recalibration — $150 to $220 (no extra parts).
• Force learning re-do — $150 to $220 (no extra parts).
• Safety beam replacement — $220 to $320 fitted.
• New remote and pairing — $90 to $140 fitted.
• New wall control — $180 to $260 fitted.
• Drive gear replacement — $180 to $280 fitted.
• New back-up battery — $120 to $180 fitted.

For Highfields, Westbrook, Glenvale, Cambooya and the immediate Toowoomba suburbs we usually attend same day. For Dalby, Warwick, Chinchilla and the further-out towns we batch trips for cost-effectiveness.

When to replace rather than repair the opener

A general rule: if the opener is over 12 years old and needs more than $300 of parts to fix, look at a replacement quote at the same time. Modern openers are quieter, safer, smartphone-controllable and far less power-hungry. We'll show you both numbers on the same visit so you can decide.