Garage Door Won't Close?
It opens fine but refuses to close, and the opener light blinks at you. That is almost always the safety beams doing their job — and it is one of the cheapest repairs a door can need.
Quick Answer
A garage door that opens but refuses to close is nearly always the safety sensors — the two photo-eyes near the floor that must see each other before the opener will let the door descend. Break, misalign, dirty or unplug that beam and the door reverses and the opener light blinks a code. Start by wiping both lenses and clearing anything in the beam path, then check both sensor LEDs are lit steady rather than blinking. If that does not fix it, the sensors, their wiring or the opener's logic board need attention, and that repair is quoted before any work starts. The other causes are travel limits set wrongly and a genuine obstruction in the tracks. Do not bypass the sensors: they are what stops a closing door landing on a child, a pet or a car bonnet.
Common Causes
Safety beams blocked or misaligned
A bin, a bike wheel, a coiled hose — or a bracket knocked out of line. The beam has to be unbroken and the two eyes pointed at each other.
Dirty or fogged lenses
Dust, cobwebs and salt film build up on the lenses over months. Common in Perth garages that sit open on breezy afternoons.
Afternoon sun blinding a sensor
The one nobody expects: low afternoon sun straight down the sensor beam floods the receiving eye until it cannot pick out its partner. The door closes fine all morning and refuses after 4pm.
Perished or chewed sensor wiring
Thin bell wire runs along the wall at skirting height, where it gets nicked, stapled through, sun-perished or gnawed.
Travel and force limits drifted
If the opener thinks the floor is lower than it is, it hits resistance early and reverses, reading it as an obstruction.
A real obstruction or track fault
Sometimes the door is right. A stone in the track, a bent rail or a seized roller stops travel and the safety system reverses as designed.
What You Can Check Safely
Safe to check yourself
- Wipe both sensor lenses with a dry cloth and clear anything sitting in the beam path
- Check both sensor LEDs — steady lights are healthy, a blinking or dark light means misalignment or no power
- Gently square up any sensor that has been knocked, then re-test
- Watch whether it fails only at certain times of day — that points to sun glare
- Look along the tracks for a stone, screw or bent section at the point it stops
Do not attempt
- Do not tape, bridge or unplug the sensors to force the door shut — that disables the only thing watching the doorway
- Do not increase the opener's force setting to 'push through' resistance
- Do not run the door repeatedly against an obstruction; you will bend track and strip the gear
When to Call a Technician
Call a technician straight away if any of the following apply:
- Lenses are clean, the beam is clear, and the light still blinks
- A sensor LED stays dark — no power reaching it
- The wiring is visibly perished, cut or chewed
- The door reverses partway with nothing in the way
- It only closes if you hold the wall button down
Recommended Services
What Perth Customers Say
“Excellent customer service, guys came out within 30 mins of call (and this was after hours) and fixed the problem quickly so I could get my garage door closed and house secure. Highly recommend their service.”
Megan Holgate · Emergency Repairs
“Came out of an evening on a publuc holiday to fix my garage door that was not shutting and stuck and hanging very unsafely. Alan was prompt polite knowledgable and came within the hour. would throughly recommend.”
Melanie Moralee · Emergency Repairs
Get Help With This Problem
Prefer to call? 0422 828 800Door stuck open overnight?
An open garage is a security problem, not an inconvenience. Hold the wall button down to close in constant-pressure mode if your opener allows it, and call us — we are open 24 hours.
Frequently Asked Questions
Start with the safety beams, because they cause most of these. Clean both lenses, clear the beam path, and check each sensor's LED is on steady. Realign any sensor that has been nudged out of square. If the light still blinks after that, the fault is in the sensors themselves, their wiring or the opener's board, and we quote that before putting it right. If the door reverses partway rather than refusing to start, look for an obstruction in the tracks or drifted travel limits instead.
Because the opener cannot prove the doorway is clear, which is not the same as it being clear. A misaligned or dirty photo-eye, a broken wire, or bright afternoon sun hitting the receiving sensor all produce exactly this: an empty doorway and a door that will not close. West-facing Perth garages get the sun version routinely, and the giveaway is that it closes perfectly in the morning.
Most openers will close in constant-pressure mode: hold the wall button down continuously and the door descends, on the understanding that you are watching the doorway yourself. It is the legitimate way to secure your garage while you wait for a repair. What you should never do is tape the sensors together or bridge them out — that leaves the safety system permanently defeated on a door heavy enough to injure someone.
If it does not move at all, suspect power, the remote or the opener. If it starts down and reverses, suspect the safety beams or an obstruction. If it closes most of the way then lifts again, the down-travel limit is set too high or the bottom seal is meeting an uneven floor. Each is a different fix, so the pattern of the failure is what tells us where to look — describe it when you call and we will bring the right parts.
It depends on what the beams actually need — realigning and re-testing is the smallest version of the job, rewiring a chewed or perished cable run is more involved, and replacing the pair of eyes more again. Either way a full auto-reverse safety test is included, and it remains one of the cheapest genuine repairs a garage door can need. If diagnosis shows the opener's logic board is the real culprit rather than the beams, that is a different repair and a different price — we will tell you which it is, and what it costs, before doing any work. There is no call-out fee.
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