It is 7.30am. The car is loaded, the kids are in the back, and the roller door will not budge. Or it is 10pm, the door is stuck halfway, and everything in your garage is on show to the street.
A roller door that stops working is not always a big repair. Sometimes it is a flat remote battery. Sometimes it is a bag of potting mix leaning against a guide. The trick is knowing what you can safely check yourself and what you should leave well alone.
This guide is set out by symptom. Find the one that matches your door, then work through the checks.
First, the safety bit
Read this before you touch anything.
- A domestic roller door curtain is heavy, and the spring inside the barrel is under serious tension. Springs, barrels and cables are not DIY territory.
- Never force a jammed door. If it will not move by hand, stop.
- Never run the motor on a door that is sitting crooked in the guides. You will bend slats and turn a small repair into a full replacement.
- Switch the power off at the wall before you inspect anything mechanical.
- Keep kids and pets clear while you are testing.
If a check below tells you to stop, stop. We would rather quote you for a service call than a rebuild.
Start with the two minute checks
A good share of the call outs we attend come down to something on this list.
- Is it plugged in? Has the RCD tripped? Try another appliance in the same socket. A light on the motor head tells you power is getting through.
- Remote batteries. Batteries fade before they fail. If the door only responds when you are standing right under it, change the battery.
- Wall button test. If the wall button works and the remote does not, the fault is in the remote or the receiver, not the door.
- Manual release. Someone may have pulled the release cord. The motor will run and the door will sit still while the drive is disengaged.
- The lock. Manual locks and bolts catch a lot of people out. Check everything is fully retracted.
- Look down the full length of both guides. Firewood, a bike pedal, a bag of pea straw, a stone washed in off the drive.
Now match the symptom
Nothing happens at all. No hum, no light.
This points to the power supply or the motor control board. Check the socket and the RCD first. If the socket is live and the motor is completely dead, the board or transformer has failed. That is a technician job.
The motor runs but the door does not move
The drive has come away from the barrel. Usually the manual release has been pulled, or the drive mechanism has worn out. Re-engage the release following your motor instructions. If the motor still spins freely, book a repair.
The door moves a little, then stops or reverses
The motor is hitting its resistance limit because something is dragging. Common causes:
- Grit or corrosion built up in the guides
- A bent or dented slat catching as it passes
- Dry or failing bearings at the barrel ends
- Force settings that have drifted out of adjustment
Do not simply wind the force setting up. That limit is a safety feature and overriding it hides the real fault.
The door closes, then pops straight back open
Either the down limit is set wrong, or the door is touching something on the way down and the safety reverse is doing its job. Check the floor line and the bottom seal. If the concrete has lifted or settled, the door can make contact before it reaches its programmed stopping point.
The wall button works but the remote does not
This is a signal problem, not a door problem.
- Fit a fresh battery
- Reprogram the remote to the motor
- Look for new interference. Cheap LED bulbs, a new heat pump, an EV charger or a solar inverter can all swamp the frequency
The door opens partway and stops
This could be an obstruction in the guide, a worn barrel bearing, or a spring that has lost tension. There is a simple test. Switch the power off, release the door, and lift it by hand. A balanced door feels manageable and stays roughly where you leave it. If it feels dead heavy or drops away from you, the spring is the problem. Stop there and call us.
The door is sitting crooked in the guides
The curtain has come out on one side, usually after a knock from a vehicle or a wheelie bin. Do not run the motor. Do not lever it back with a screwdriver. Roller door slats bend easily, and a forced fix often costs more than the original repair would have.
Grinding, screeching or a rattle you have not heard before
Noise is early warning. Dry curtains squeal. Failing bearings grind. Loose brackets rattle. Book a service while it is still a service, not a breakdown.
What New Zealand conditions do to roller doors
Where you live changes what tends to fail.
Christchurch and Canterbury
Frosty mornings stiffen grease and rubber. A door that groans through July and behaves in January usually needs cleaning and relubricating, not a new motor. Bottom seals can stick to cold concrete overnight.
Ground movement is still a factor here. Settling since the earthquakes shows up as doors binding in the guides or catching on an uneven floor line. Nor’west grit also builds up in the guides faster than most people expect.
Auckland
Salt air is the main enemy. Anywhere close to the coast, from the North Shore beaches through to the western bays and out to the Manukau, you get corrosion at the fixings, the barrel ends and the base of the guides. Humidity inside a closed garage speeds it up. Rust in a guide is a slow jam waiting to happen.
In both cities, autumn leaves and debris pile into the guides. Two minutes with a broom and a hose beats a call out.
What you can safely do yourself
- Clear and clean the guides with a brush and water
- Wipe the curtain down, especially near the coast
- Replace remote batteries
- Reset a tripped RCD
- Test the auto reverse
- Book an annual service
What to leave to a technician
- Anything involving the spring, barrel or cables
- Slat replacement, or a curtain that has come out of the guides
- Motor limit and force adjustments
- Control board, capacitor and wiring faults
- A door that feels heavy or unbalanced by hand
One test worth doing today
AS/NZS 60335.2.95 covers entrapment protection for residential door operators. In plain terms, your door has to stop and reverse when it meets an obstruction.
Test it. Stand a solid object such as a block of timber on the floor under the door, then close it. The door should make contact, stop and reverse. If it keeps pushing, the door is not safe around children or pets. Get it looked at.
When to stop diagnosing and pick up the phone
Call a technician if:
- The door feels heavy or unbalanced when you lift it by hand
- The curtain is out of the guides, or slats are bent
- The socket is live but the motor is dead
- Something snapped, banged or let go
- The door will not reverse off an obstruction
- It is stuck open and your garage is exposed
Get it sorted
Kinetic Access repairs and services garage doors, roller doors and openers across Christchurch and Auckland. We carry common parts on the van, so most faults get fixed on the first visit.
Tell us what the door is doing and we will tell you straight what it needs.