Garage Door Won't Close All the Way — Adelaide Troubleshooting

A door that almost-but-not-quite closes is one of the more frustrating garage door faults. Usually it’s one of three things, all relatively cheap to fix. Here’s the diagnostic.

Symptom 1: Door reverses just before touching the floor

Most likely cause: safety-beam misalignment.

The infrared safety beams (small sensors mounted on each track at floor level) detect obstructions. If they’re misaligned, dirty, or one’s been knocked, the opener thinks something’s in the way and reverses for safety.

DIY check:

• Look at each safety-beam sensor. Most have a green LED when aligned and no obstruction.
• Wipe both lenses with a soft cloth.
• Check that nothing’s leaning against either bracket.
• Wave your hand under the door — does it reverse normally? If yes, beams are working; the cause is something else.

Fix: alignment, often free if you can do it; $80-$140 for a technician visit.

Symptom 2: Door bounces open after touching floor

Most likely cause: force-setting too sensitive, OR the door is hitting an obstruction (raised floor, bowed bottom seal, debris).

Modern openers have a “safety reverse” feature — if the door hits an obstruction during closing, it reverses. The sensitivity of this is set by the force setting on the motor. Set too sensitive and the door reverses on contact with the floor itself.

DIY check:

• Visually inspect the floor below the door for debris.
• Check the bottom seal for hardening or curling (can push back against the floor).
• Listen carefully — does the motor sound stressed just before reversing?

Fix: force-setting recalibration. $80-$140 service call.

Symptom 3: Door stops 5-15cm short of fully closed

Most likely cause: down-limit switch out of adjustment.

The opener has two limit switches — one for “fully open” and one for “fully closed.” When the door reaches the closed-limit, the motor stops. If the limit’s drifted upward, the door stops short.

DIY check: older openers have visible limit-set screws on the motor housing; newer openers (smart and modern) set limits via the wall button or app.

Fix: limit-switch reset. Often $0-$80 if combined with another service.

Symptom 4: Door reverses partway through closing

Most likely cause: door is binding in the tracks, OR a panel hinge is catching.

DIY check: with the motor disengaged (manual release), lift and lower the door manually. If you feel a hitch or catch at a specific point, that’s where the binding is.

Fix: track inspection and adjustment, hinge replacement if damaged. $180-$340 typical.

Symptom 5: Door closes once, then on next attempt won’t close at all

Most likely cause: logic board entering “obstruction-detected” lockout. After 2-3 obstruction reversals, some openers lock out closing for safety.

DIY check: unplug the opener for 30 seconds, then plug back in. This resets the logic. Try again.

If it works once and locks out again — there’s a real ongoing obstruction (track, alignment, force setting). Service call needed.

When to call

• Safety-beam misalignment doesn’t resolve after cleaning + visual alignment
• Force-setting recalibration is needed (specialised tool / procedure)
• Limit-switch resets don’t hold (electronic fault)
• Door is binding in a way that suggests track damage

What it costs

Issue	Range
Safety beam alignment / cleaning	$80-$140
Force-setting recalibration	$80-$140
Limit-switch reset	$0-$140 (often combined)
Track binding repair	$180-$340
Logic-board reset (if it persists)	$260-$480

Related

• Adelaide repair pricing
• Common Adelaide garage door problems