A roller blind that will not go up, will not stay down or rolls on a slant is one of the most common household annoyances. Most faults come down to a handful of causes, and many can be sorted in a few minutes once you know which one you are dealing with.
Quick answer: A roller blind usually won’t roll up because the chain has slipped off the sprocket, the control unit is worn, a spring has lost tension, or a motor battery is flat. Check the brackets are secure first, then the control. Never force the blind or remove the child safety device.
Roller blind won’t roll up? The usual causes
A roller blind won’t roll up when the chain has jumped off its sprocket, the clutch inside the control unit is worn, the tube has come out of a bracket, the fabric is snagged, a spring has lost tension, or a motorised blind has a flat battery or lost pairing. Identify the operating type first, because the fix differs.
Before you try anything, stop and look. Forcing a stuck blind can break the control unit. Check three things:
- Are both ends of the tube seated in their brackets? If one end has dropped, the blind will not turn properly.
- Is anything catching the fabric? A window handle, a sill, a plant or a curtain can snag the fabric or bottom bar.
- What kind of blind is it? A chain at one side means a chain-operated blind. No chain and a handle or pull on the bottom bar usually means a spring or cordless blind. A remote, wall switch or app means motorised.
What are the common roller blind faults and fixes?
The common roller blind faults are a blind that won’t roll up, won’t stay down, rolls unevenly, has a slipping chain, or moves slowly. Each has a likely cause and a safe first step you can try yourself. If the safe fix does not work, or the fault is inside the tube or motor, it is time to call someone.
| Symptom | Likely cause | Safe fix to try | When to call someone |
|---|---|---|---|
| Won’t roll up (chain blind) | Chain off sprocket, worn control, tube out of bracket | Reseat the tube, refit the chain on the sprocket | If the chain turns but the tube does not |
| Won’t stay down, creeps up or down | Worn clutch, or spring tension set wrong | Check the chain tensioner is fixed; adjust spring tension if designed to be adjusted | If it keeps slipping after checks |
| Chain slips or clicks | Chain loose, chain worn, sprocket teeth worn | Fix the tensioner so the chain is taut; pull straight down | If new chain still slips |
| Rolls unevenly or drifts to one side | Brackets not level, fabric wound off-square | Level the brackets, unroll fully and re-roll straight | If fabric edges are fraying or creased |
| Spring blind won’t rise fully | Spring has lost tension | Re-tension only if the maker’s guidance allows it | If the spring is sealed or keeps losing tension |
| Motorised blind won’t move | Flat battery, lost pairing, tripped limits | Charge the battery, check remote battery, re-pair | If charged and paired but still silent |
| Motor stops after several runs | Thermal protection has paused it | Leave it to cool for a while, then try again | If it happens with normal use |
How do you fix a chain-operated roller blind that won’t go up?
To fix a chain-operated roller blind that won’t go up, check the tube is seated in both brackets, then check the chain is running on the sprocket inside the control unit. If the chain turns freely but the tube does not move, the clutch is probably worn and the control unit needs replacing rather than adjusting.
Chain-operated blinds use a looped bead chain that runs over a toothed wheel (the sprocket) in the control unit. A clutch holds the blind in place when you let go. Most faults happen here.
Chain off the sprocket
If the chain hangs limp or pulls straight through without turning anything, it has probably jumped off the sprocket. This often happens when the chain is pulled sideways or the tensioner has come away from the wall.
- Lower the blind fully if it will go, or support the fabric so it cannot drop.
- Lift the blind out of its brackets, idler end first, then the control end.
- Look at the control unit. On many designs you can see where the chain feeds in.
- Feed the chain back around the sprocket so the beads sit in the teeth, keeping both sides of the loop even.
- Refit the blind into its brackets, control end first, and check it clicks home.
- Refix the chain tensioner to the wall so the chain hangs taut.
- Test gently, pulling straight down.
If the chain will not stay on, the sprocket teeth may be worn, or the chain may be the wrong pitch for the control. That needs a replacement part.
Chain joiner has come apart
Many chains are fitted with a breakaway connector that deliberately separates under load. It is a safety feature, not a fault. Push the two ends back into the connector. If it keeps coming apart in normal use, check the chain tensioner is fixed properly and that nobody is pulling the chain at a sharp angle.
Worn clutch or control unit
A worn clutch shows up as a blind that slips down by itself, won’t hold its position or spins without lifting. It cannot be adjusted back to health. The control unit needs replacing, and it needs to be the right size and type for the tube. If the fabric is also old, compare the cost with a new blind.
Why won’t my roller blind stay down, or stay up?
A roller blind that won’t stay down usually has a spring with too much tension or a worn catch. One that won’t stay up, or creeps down, usually has a worn clutch in the chain control or a failed brake in a cordless mechanism. On chain blinds, check the tensioner is firmly fixed before blaming the mechanism.
On a spring blind that shoots back up, the spring usually has too much tension or the catch that holds it has worn. Some older spring blinds use a pawl and ratchet at the pin end: a small catch that engages when the tube stops turning. Dust or wear can stop it catching. Cleaning away dust can help, but a worn catch means a new mechanism.
On a chain blind that creeps down, the clutch is the likely culprit. Heavy fabrics on long drops put more load on the clutch, and a control unit that is undersized for the blind will struggle. We size the control to the blind when we measure.
How do you re-tension a spring roller blind safely?
Re-tensioning a spring roller blind is only safe on blinds designed to be adjusted, usually older style springs with a flat pin at one end. Many modern cordless and sealed spring systems are not user-adjustable. Check the maker’s instructions first, wear eye protection, and keep fingers clear, because a tensioned spring can unwind suddenly.
If your spring blind is the older type with an exposed flat pin, the usual method is simple:
- To add tension: pull the blind about halfway down so it locks, lift it out of the brackets, roll it up by hand, then refit it and test. Repeat if needed.
- To reduce tension: with the blind rolled up, lift it out of the brackets, unroll one or two turns by hand, refit and test.
- Test between each adjustment. Small changes make a big difference. Too much tension makes the blind fly up and wears the spring faster.
Stop if the pin spins freely, the spring feels loose inside the tube, or nothing changes after a few adjustments. The spring has probably failed and the mechanism or blind needs replacing.
Why is my roller blind rolling unevenly?
A roller blind rolls unevenly when the brackets are not level, the fabric was wound off-square, the fabric has stretched on one side, or something is rubbing against one edge. The fabric drifts toward one end of the tube and builds up in a cone shape, which fitters call telescoping. Left alone, it frays and creases the edges.
Try these checks in order:
- Check the brackets are level. Use a spirit level across the tops. Even a few millimetres out can cause drift on a wide blind.
- Check both brackets are tight. A loose bracket moves under load and pulls the tube off-square.
- Unroll the blind fully and re-roll it slowly, guiding the fabric straight onto the tube.
- Look for rubbing. A recess wall, tile edge or handle catching one side will push the fabric across.
If the fabric has creased or stretched unevenly, it will keep drifting however level the brackets are. A fitter can sometimes correct mild drift by adjusting the fixing or packing the tube, but badly telescoped fabric usually needs replacing.
Uneven rolling is common in older houses where the window reveal is not square, such as many Victorian and Edwardian terraces across London. When we measure, we check whether the recess is square and plan the fixing so the blind hangs level even if the window is not.
What should you check on a motorised roller blind that won’t move?
On a motorised roller blind that won’t move, check the power first: charge a rechargeable motor, replace the remote’s battery, and check the mains supply on wired motors. Then check the remote is still paired to that channel. If the motor stops after several runs, it may have paused on thermal protection and needs time to cool.
Most apparent motor failures are not motor failures. Work through this list before assuming the worst:
- Battery charge: rechargeable motors run down slowly and then stop. Some give a warning, such as a slower movement or a beep.
- Remote battery: the small coin cell in the handset is often the real culprit.
- Pairing: power cuts, battery changes or hub updates can occasionally lose the link.
- Limits: if the blind stops short or overruns, the top and bottom limits may need resetting, following the maker’s instructions.
- Obstruction: many motors stop if something blocks the fabric.
Do not open the motor housing or tube. If power and pairing are fine and it still will not run, it needs someone with the right tools and parts. You can read more about how motorised roller blinds work and why they suit hard-to-reach windows.
Can you remove the child safety device if it gets in the way?
You should never remove a roller blind’s child safety device, even if it seems to cause the fault. Looped cords and chains are a strangulation risk for young children. Safety devices such as chain tensioners, breakaway connectors and cleats reduce that risk, and new blinds with looped chains are required to have them. Fix the device, not remove it.
The requirements for internal blinds are set out in BS EN 13120, the standard for internal blinds covering performance and safety. RoSPA points out that since 2014, a new blind with a looped cord or chain comes with a safety device already installed, and it warns not to cut cords or chains, because that does not remove the risk and can damage the blind.
Government guidance on child safety and blind cords also advises moving cots, beds and furniture away from windows, and keeping cords secured out of reach.
A missing or loose tensioner can also cause faults, because the chain is meant to hang taut. If yours has come away from the wall, refix it rather than leave it hanging. If you have young children and would rather have no chain at all, child-safe roller blinds include cordless and motorised options.
Key takeaways
- Work out whether the blind is chain, spring or motorised before trying a fix.
- Check the tube is seated in both brackets and nothing is snagging the fabric.
- A chain off the sprocket is often a quick fix; a worn clutch means a new control unit.
- Only re-tension springs designed to be adjusted, and never force a sealed mechanism.
- Most motorised faults are flat batteries, remote batteries or lost pairing.
- Never remove child safety devices. Refix them instead.
Common mistakes when fixing a roller blind
The most common mistakes when fixing a roller blind are forcing a stuck chain, pulling the chain at an angle, over-tensioning a spring, cutting a chain or removing the tensioner, and fitting a replacement chain or control that does not match the tube. Each can damage the mechanism or create a safety risk.
- Yanking a stuck chain: it strips the sprocket teeth and snaps the chain.
- Over-winding a spring: makes the blind fly up and shortens the spring’s life.
- Mismatched parts: controls and chains come in different sizes and pitches.
Who can repair my roller blind in London, Essex or North Kent?
HD Blinds repairs and provides aftercare for roller blinds that we supplied and fitted ourselves, across London, Essex and North Kent. If your blind came from somewhere else and has failed, we can measure and fit a new made-to-measure roller blind, with a free home measure, fabric samples and a written, no-obligation quote.
If we fitted your blind, our roller blind repair page explains how to get it looked at. If not, and the fabric or mechanism is past saving, a replacement is often the better value. We measure every window ourselves and our own team fits, which matters most on the out-of-square recesses and tall windows where faults tend to start.
Frequently asked questions
Why does my roller blind chain keep slipping?
A roller blind chain usually slips because it is not held taut, the chain or sprocket teeth are worn, or the chain is the wrong size for the control. Check the chain tensioner is fixed firmly to the wall and pull the chain straight down. If a new chain still slips, the control unit needs replacing.
How do I get my roller blind to roll up again?
First check both ends of the tube are seated in the brackets and nothing is catching the fabric. On a chain blind, check the chain is on the sprocket. On an older adjustable spring blind, add tension a little at a time. On a motorised blind, charge the battery and check pairing.
Why does my spring roller blind shoot up?
A spring roller blind that shoots up usually has too much spring tension, or the catch that holds it in place has worn or clogged with dust. On adjustable older springs, reduce tension by unrolling one or two turns by hand with the blind out of its brackets. Sealed mechanisms need replacing.
Is it safe to take the chain tensioner off my blind?
No. The chain tensioner is a child safety device that keeps the looped chain taut and out of reach. Removing it creates a strangulation risk for young children and can also cause the chain to slip. If it has come loose or is in the way, refix it securely rather than remove it.
Why is my roller blind rolling up crooked?
A roller blind rolls up crooked when the brackets are not level, one bracket is loose, the fabric was wound off-square, or something rubs one edge. Level and tighten the brackets, then unroll fully and re-roll slowly. If the fabric has stretched or creased, it will keep drifting and needs replacing.
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