A shutter that refuses to lift on a Monday morning costs you trade by the hour, and the panic usually leads to someone forcing the key or yanking the manual chain until something expensive breaks. Most jam-ups come down to five or six causes, and roughly half of them you can check yourself in under ten minutes. Here is how to work through it sensibly before anyone touches a crowbar.
On electric shutters, the most common call-out we get turns out to be a supply issue rather than a mechanical one. Roller shutter motors are usually on their own fused spur or a dedicated circuit, and that spur is often tucked above a suspended ceiling, behind stock shelving or inside a lockable isolator by the door. Find it before you assume the motor has died.
Tubular motors also have a built-in thermal cut-out. If the shutter has been run repeatedly, say during a delivery morning, the motor will stop and stay silent until it cools. That typically takes 15 to 20 minutes, and it is not a fault.
If the motor runs but the curtain does not move properly, or it moves an inch and stops, the problem is almost always physical. Take a torch and look up both guide rails from ground level. A shutter that has been clipped by a delivery trolley, a wheelie bin or a reversing van will have a slight bow in the rail or a kinked lath, and the curtain then binds as it tries to lift.
Bottom rails take the worst of it. A dropped kerb, a flooded doorway or years of grit will leave the rail sitting unevenly, and on older shutters the bottom lath can rust and swell where it meets the ground. Sweep the track properly. On busy stretches like Coventry Road, Soho Road or Stratford Road, compacted litter and takeaway grit in the guides is a genuine and regular cause of jams.
Never force a bound shutter with the motor. You will strip the crown wheel or tear the lath ends out of the curtain, and a curtain replacement is a far bigger job than straightening a rail.
Push-up shutters rely on a torsion spring inside the barrel doing most of the lifting. When that spring loses tension or snaps, the shutter feels suddenly and dramatically heavier, and often it simply will not lift at all. You may have heard a loud bang the last time it was closed. Springs are under serious load and are not a do-it-yourself repair.
On chain-operated shutters, check that the chain has not jumped the sprocket or twisted. If the chain pulls freely but nothing happens at the barrel, the drive has disengaged internally.
Most electric shutters have a manual override, either a hand crank socket near the motor end or an emergency chain hoist behind a small cover. Learn where yours is now rather than on the morning it fails, and note that overrides are designed for occasional use, not daily operation.
Attempted forced entry often leaves a shutter that looks fine but will not lift. Common signs are a barrel lock that turns freely without releasing, bullet locks that have been shunted out of alignment, or a bottom rail that has been jemmied so the shoot bolts no longer clear their sockets. In these cases stop, photograph everything for insurance, and get it assessed.
If the shutter is stuck shut and you need access urgently, a fitter can usually release it without cutting, but be prepared for a temporary fix on the day and a return visit for parts. Motor replacements, spring re-tensioning and lath sections are rarely stocked to suit every profile.
Costs vary widely with shutter type, size and whether access equipment is needed. A straightforward call-out to free a jam, realign a rail and service the mechanism sits at the lower end. Replacing a tubular or centre motor, re-tensioning a broken spring or fitting a new curtain sits considerably higher, and anything above about 3.5 metres in width or requiring a tower or platform will add to it.
Regular servicing genuinely helps. An annual check that lubricates the guides, tightens fixings, tests the safety brake on larger shutters and inspects the curtain for fatigued laths will catch most of these faults before they leave you locked out. If your shutter is over a public footpath, that inspection also matters for your liability.
That pattern usually means an obstruction or a bind in the guides, and the motor's overload protection is stopping it. Check for grit, a bent guide rail or a damaged lath before running it again, because repeated attempts can damage the drive.
Most electric shutters have a manual override, either a crank handle socket or an emergency chain, and it is safe to use if the shutter is not physically jammed. If it feels unusually heavy or will not budge with light effort, stop, as that often indicates a broken spring or a bound curtain.
It depends on the time of day and how many jobs are already booked, but a shutter that is preventing you from trading or securing premises is normally treated as urgent. Have the shutter's approximate width, whether it is manual or electric, and what you have already tried ready when you call.