How to tell if your garage door spring is broken

The clearest broken garage door spring signs are a loud bang from the garage, a visible gap in a coiled spring, and a door that suddenly feels far heavier than usual or will not stay open. If an electric door lifts a few inches and stops, or rises lopsided, a spring is a likely culprit too. Once you suspect a broken spring, stop using the door, keep people and cars clear of it, and get it looked at.

Springs do the heavy lifting on almost every garage door, so when one fails the whole door behaves differently. This guide explains what the springs actually do on the common door types you find around Liverpool and Merseyside, the symptoms that point to a failure, what you can safely check yourself, and what a proper repair involves.

What does a garage door spring actually do?

A steel up-and-over, insulated sectional or timber garage door weighs far more than anyone could comfortably lift by hand. The springs are there to counterbalance that weight, so that the door feels light to lift manually and so that an electric operator only has to guide it rather than haul it.

The spring stores energy as the door closes and gives it back as the door opens. When the system is balanced correctly, a manual door should stay roughly where you leave it part-way through its travel. That balance is the thing a broken spring destroys.

The main spring types

• Torsion springs sit on a horizontal shaft above the door opening. They twist to store energy and turn cable drums at each end of the shaft. They are used on most sectional doors and many modern up-and-over doors.
• Tension (extension) springs stretch rather than twist. On older canopy and retractable up-and-over doors, which are common on 1960s to 1990s semis and in council-built garage blocks, they usually run down the sides of the frame or along the horizontal tracks.
• Barrel springs sit inside the axle of a roller garage door. They are hidden, so a failure is usually noticed through the door's behaviour rather than by sight.

Side-hinged doors swing open like a pair of gates and have no counterbalance springs, so if your door opens that way, a heavy feel points to hinges, drop bolts or frame movement instead.

Broken garage door spring signs: seven things to look for

Most spring failures show up in one or more of these ways, and you can spot most of them from a distance.

1. A loud bang from the garage. A torsion spring under load releases its energy in an instant when it fractures. Many people mistake it for something falling off a shelf.
2. A visible gap in the coil. On a torsion spring, look at the spring above the door from a safe distance. A healthy spring is a continuous tight coil; a broken one shows a clear gap of a few centimetres where the wire has snapped and unwound.
3. A stretched or hanging tension spring. On an up-and-over door with side springs, a broken spring may be dangling, visibly longer than its partner, or missing its end hook.
4. The door suddenly feels very heavy. With the counterbalance gone, you are lifting the full weight of the door. If a door that used to lift with one hand now needs real effort, stop.
5. The door will not stay open, or drops quickly. A door that slams down or creeps closed from the half-open position has lost its balance.
6. An electric opener struggles or gives up. Many operators lift the door a short distance and then stop or reverse, because their force sensing detects an abnormal load. Some hum without moving the door at all.
7. The door rises unevenly or the cables go slack. On a door with two springs, losing one can make it lift crooked. Loose or tangled lift cables at the bottom corners are another common giveaway on sectional doors.

A snapped cable, seized roller or motor fault can produce similar symptoms, so our wider guide to common garage door problems is worth a look if the picture is not clear.

How spring failure shows up on different door types

The type of door you have changes both where the springs are and how a failure behaves. This table summarises what to look for.

Up-and-over doors make up a large share of the domestic doors in areas such as West Derby, where many houses have single integral or attached garages from the post-war decades. If yours is one of these, our up-and-over garage door repair page covers the spring arrangements and common faults in more detail. For panelled doors on a torsion shaft, see sectional garage door repair.

Is it safe to use a garage door with a broken spring?

No. This is one fault where the honest answer is simply to stop, for three reasons.

• The door can fall. Without its counterbalance, a door held open can come down hard and fast. That is a genuine injury risk, particularly to children and pets, and it can damage cars.
• The remaining parts are under strain. On a two-spring door, the surviving spring is now trying to do the work of two. Cables, drums and brackets are loaded unevenly, making a second failure more likely.
• The opener will be damaged. Electric operators are designed to move a balanced door. Repeatedly forcing one to lift an unbalanced door wears the gears, the drive and the control board, turning one repair into two.

If the door is stuck closed and your car is inside, it is tempting to force it. Resist that. Getting a door open safely with a broken spring is a job for someone with the right tools and the knowledge to support its weight, which is exactly what an emergency garage door repair visit is for.

Why do garage door springs break?

Springs are a wear item. They fail through metal fatigue, and almost every spring eventually reaches the end of its life. The main factors are:

• Cycle count. Springs are rated in cycles, one cycle being an open and a close. Standard springs are commonly rated at around 10,000 cycles, though the real figure varies by manufacturer and specification. A household that uses the garage as its main entrance several times a day uses that up far faster than one that opens it occasionally.
• Corrosion. Rust pits the surface of the wire and creates weak points where fractures start. Garages in coastal areas such as Crosby, where salt air reaches well inland, and damp, unheated garage blocks generally see springs corrode faster.
• Lack of maintenance. A spring that has never been lubricated suffers more friction between coils, and a door that is out of balance or binding in its tracks puts extra stress on it every cycle.
• Cold weather. A spring already near the end of its life often gives way on a cold morning.
• Wrong or mismatched springs. An incorrectly sized spring, or a past repair that replaced only one of a pair, shortens service life.

What you can safely check yourself

There is a clear line between looking and touching. Looking is fine. Adjusting, releasing or removing springs, cables, bottom brackets or cable drums is not, because they hold enough stored energy to cause serious injury. These checks keep you on the right side of that line.

• Look, from a distance. With the door closed, stand back and inspect the springs for a gap, a dangling end or obvious stretching. Use a torch rather than climbing up for a closer view.
• Check the cables by eye. Look at the lift cables at the bottom corners of a sectional door. If one is slack, frayed or off its drum, leave it alone.
• Stop using the opener. If you have an electric door, switch it off or unplug the operator so nobody presses the remote out of habit.
• Do not pull the manual release with the door open. On an electric door with a broken spring, releasing the operator while the door is up can let it drop. If the door is closed, leave it closed.
• Keep the area clear. Move cars, bikes and anything else out from under the door if you can do so without operating it, and keep children and pets away.
• Note what happened. When the bang occurred, how the door has behaved, and the make of the door if you can see a label.

What does a garage door spring replacement involve?

A proper garage door spring replacement is more than fitting a new spring. A competent engineer will usually:

1. Secure the door so it cannot move while the springs are unloaded.
2. Identify the correct spring by wire size, length, inside diameter and wind direction, matched to the weight and height of your door.
3. Replace springs as a pair on doors that use two, since the surviving spring has been through the same number of cycles and has just been overloaded.
4. Inspect the cables, drums, bearings, rollers and hinges, and replace anything worn or damaged by the failure.
5. Set the tension so the door is properly balanced, then test it manually and with the opener.
6. Check that the operator's force and safety reversal settings are correct for the newly balanced door.

On some older up-and-over doors the original spring mechanisms are no longer made. An equivalent can often be sourced, but occasionally the condition of the whole door makes replacement the better option.

Getting it fixed: when to call a local engineer

If you have heard a bang, can see a broken coil, or your door has suddenly become heavy or lopsided, it is time to call. The same applies if the door is stuck open and will not close, because an unsecured garage is a security problem as well as a safety one.

We provide garage door repairs in Liverpool and across Merseyside, covering up-and-over, sectional and roller doors. Call us or use the booking form, tell us what you have noticed and, if you can, send a photo of the door and the springs. That helps a local engineer arrive with the right parts.

Frequently asked questions