Why is my roller garage door not closing? A roller garage door that won’t close is most often caused by a misaligned or dirty safety photocell (around 35-40% of UK callouts), uneven slat winding inside the drum (around 20%), drifted tubular motor limits (15%), a flat remote fob battery (10%), or a faulty control board (10%). Most of these are fixable at home with basic tools and ten minutes; if the door is wound unevenly inside the housing or the motor has tripped its thermal cut out, call a fitter. This guide walks through every cause, the diagnostic order to test them in, and what each fix costs in the UK in 2026.
The 8 most common reasons a UK roller garage door won’t close
The cause frequency split below is drawn from MoneySavingExpert forum threads on roller door faults and TWF’s own UK callout pattern across 2025-2026. Over 80% of “won’t close” calls trace back to the first three causes.
| # | Cause | How common | DIY fix? | Approx UK cost |
|---|---|---|---|---|
| 1 | Misaligned or dirty photocell sensors | ~35% | Yes, clean and realign | £0 |
| 2 | Slats wound unevenly inside the drum | ~20% | No, call a fitter | £80-£150 callout |
| 3 | Tubular motor limits drifted out of position | ~15% | Yes if you can reach the reset | £0 (or £140-£260 if motor needs replacing) |
| 4 | Flat remote fob battery | ~10% | Yes, swap CR2032 or 27A | £2-£5 |
| 5 | Faulty control board or receiver | ~10% | Sometimes, reseat connections first | £45-£120 board |
| 6 | Worn safety edge (light guard) | ~5% | Replacement only | £35-£90 part |
| 7 | Power outage or tripped fuse | ~3% | Yes, check consumer unit | £0 |
| 8 | Manual override accidentally engaged | ~2% | Yes, disengage override lever | £0 |
Step by step diagnostic: how to find the cause in 10 minutes
Run the checks in this order. Each step rules out the cheapest, most common cause first so you don’t pay a fitter for something a 12p coin cell battery would have fixed.
Step 1: Check power and try a different remote
Open the consumer unit and check the garage door circuit hasn’t tripped. If you have a spare remote fob or a wall mounted button, try it. If the wall button works but the remote doesn’t, you’ve narrowed it to the remote (battery or pairing). The Teleco 2-button remote fob is the most common replacement on TWF doors.
Step 2: Inspect the photocells
Photocells are the small sensors mounted near the bottom of each guide rail. They project a beam across the threshold; if the beam is broken or misaligned, the door will refuse to close as a safety feature. Wipe both lenses with a microfibre cloth and check that the LEDs on each unit are showing solid (not flashing). A spider’s web across the beam is the single most common UK cause of a door that opens fine but refuses to close.
Step 3: Look at the drum from outside
Stand a few metres back and watch the door as you press close. If the slats are visibly wound unevenly inside the drum housing, stop trying to operate it. Forcing the motor against a tangled drum will burn out the gearbox. This is one of the few faults that genuinely needs a fitter, the housing has to come off and the slats unwound by hand. Expect £80-£150 for a callout.
Step 4: Test the manual override
Every UK roller door is required by BS EN 12453 to have a manual override that lets you operate the door without power. If you can wind it closed by hand but the motor refuses to drive it, the problem is electrical (motor, board, or wiring) not mechanical. Keep an external manual override kit fitted to every door, it’s the single most useful £45 you’ll spend on safety.
Step 5: Check the safety edge
The rubber strip along the bottom of the curtain (the safety edge) contains a pressure sensor. If the rubber has split or the sensor inside has shorted, the door will refuse to close because it thinks it’s hitting an obstruction. Squeeze the edge by hand; you should feel firm rubber, not soft or crushed sections. Replacement safety edge light guards start at around £85.
Step 6: Reset the motor limits
The tubular motor inside the drum has two limit switches: one for fully open, one for fully closed. If the closed limit drifts (it can happen after a power cycle or a manual override use), the motor will stop short and reverse, thinking it has hit the floor. Reset procedure varies by motor, TWF’s 50Nm tubular motor and 80Nm tubular motor both come with a printed setup card; if you’ve lost it, the TWF roller door specialist team can email a fresh copy.
Step 7: Test the control board
If steps 1-6 rule everything else out, the control board is the suspect. Pop the cover off the wall mounted control box, unplug it from the mains for 30 seconds, then reseat the ribbon connectors. A bad connection accounts for around half of “faulty board” calls. If the board is genuinely dead, replacement Teleco control panels start at around £85.
When you can DIY versus when to call a fitter
From the eight causes above, six are within DIY scope for any reasonably handy homeowner: photocell cleaning, battery swap, manual override disengage, fuse check, motor limit reset, and control board reseating. The two you should not attempt are uneven drum winding (the curtain has to come down) and a fully seized motor (live working at height). Both need an engineer.
UK replacement part costs in 2026
| Part | TWF retail price (from) | Typical fit time |
|---|---|---|
| Tubular motor (50Nm) for doors up to ~10sqm | £140 | 1-2 hours |
| Tubular motor (80Nm) for doors up to ~16sqm | £260 | 1-2 hours |
| Teleco control panel kit | £85 | 30-45 min |
| Replacement Teleco 2-button remote fob | £25 | 10 min (pair to receiver) |
| External manual override kit | £45 | 20-30 min |
| Safety edge / light guard strip | £85 | 30-45 min |
| TWF55 auto lock | £55 | 15 min |
| TWF77 auto lock | £75 | 15 min |
If the door is more than 10 years old and you’re already spending over £200 on parts, work through the repair or replace decision guide before committing. A new TWF DIY roller garage door kit starts at £620 fully insulated with a 5-year warranty and electric operation as standard.
Prevention: the 5-minute roller door MOT
Most “won’t close” callouts could have been prevented by 30 minutes of maintenance per year. Forum consensus on MoneySavingExpert (as one Securoglide owner put it: “keep the runners and rollers lubed with white grease twice a year”) backs the schedule below.
- Twice a year: apply white lithium grease to both guide rails. Avoid WD 40, it’s a solvent, not a lubricant, and strips existing grease.
- At every clock change: wipe the photocells, check beam alignment, brush debris from the threshold.
- Every 6 months: test the manual override. A seized override is no use during a power cut.
- Every 18 months: proactively replace the remote fob battery. Doesn’t matter if it’s still working, old cells leak.
- Annually: check the safety edge for splits or crushed sections.
For doors out of warranty, an annual service from the TWF roller door repair team typically costs £80-£120 and catches issues before they turn into emergency callouts.
Frequently asked questions
Why does my roller garage door open but not close?
Almost always a photocell or safety edge fault. Both are safety devices required by BS EN 12453, and both default to refusing to close (rather than refusing to open) so the door can’t trap a person or pet. Clean the photocells first; if that doesn’t solve it, inspect the rubber safety strip along the bottom of the curtain.
How do I reset the limits on my roller garage door motor?
The procedure varies by motor make. On most TWF tubular motors, you press and hold the up limit button on the motor head while running the door to the full open position, then repeat for the down limit at the closed position. The setup card that came with the motor has the exact sequence; if it’s lost, contact TWF and we’ll email a replacement.
Can I open a roller garage door manually if the motor fails?
Yes, if you have an external manual override kit fitted. The override engages a hand crank that bypasses the motor. UK Building Regulations Approved Document M and BS EN 12453 effectively require a manual override on any power operated door, so if your roller door has no override at all, that’s a separate compliance issue worth fixing.
How much does it cost to fix a roller garage door that won’t close in the UK?
For DIY fixes (photocells, batteries, fuse, override), £0-£5. For DIY part replacements (remote, safety edge, motor), £25-£260 depending on what’s failed. For an engineer callout, expect £80-£150 for diagnosis and basic mechanical fixes, £180-£400 for a motor swap, and £450+ if the curtain has to come down for a tangled drum.
Why does my roller garage door bounce back up when it tries to close?
Drifted closed limit on the tubular motor. The motor thinks the floor is higher than it is, so when the curtain reaches the false floor it reverses. Reset the closed limit using the procedure on your motor’s setup card. If the bounce is intermittent rather than constant, the safety edge sensor may be triggering instead, squeeze the rubber strip to test.
What stops a roller garage door from closing in cold weather?
Three things: thickened lubricant in the drum bearings (clean and re grease with white lithium), shrunk rubber on the safety edge (replace), and condensation across the photocell lenses (wipe and consider repositioning if it’s a recurring winter issue). UK garage doors below 0°C also pull more current, a marginal control board can trip in cold that runs fine in summer.
Should I replace or repair a roller garage door that won’t close?
Repair if the door is under 10 years old and the part cost is below £250. Replace if the door is over 12 years old, has multiple ageing components, or if the curtain itself is corroded. Use the repair or replace decision guide to work through the cost vs lifetime maths properly.
How long does it take to fix a stuck roller garage door?
Photocell fix: 5 minutes. Battery swap: 2 minutes. Limit reset: 10-15 minutes. Control board swap: 30-45 minutes. Motor replacement: 1-2 hours. Tangled drum (engineer only): 2-3 hours plus parts. The longest wait is usually getting the parts delivered, not the fitting.
Sources and further reading
- MoneySavingExpert forum thread Problems with roller garage door fitted 3 years ago (forums.moneysavingexpert.com)
- HSE PUWER 1998 (Provision and Use of Work Equipment Regulations), safety device requirements for power operated doors
- BS EN 12453, Safety in use of power operated doors
- Door & Hardware Federation (DHF) UK Code of Practice TS 011, power operated garage doors
- Rollerdor and Quay Facilities UK industry troubleshooting guides
This guide was reviewed by the TWF roller door specialist team. Last updated April 2026. If your door symptoms don’t match any of the eight causes above, the professional repair service can diagnose and quote remotely from a 30-second phone video of the fault.
