Motor hums but the shutter does not move
Often a failed capacitor on single-phase units, a sheared drive key, a stripped gear or a broken chain.
Motors & controls
Roller Shutter Motor and Control Repairs
A shutter that does nothing is not always a failed motor. Around half the 'motor faults' we attend turn out to be controls, limits or supply.
What this service covers
The service in practice
Motor and control faults are the largest single category of roller shutter breakdowns. The symptoms overlap — nothing happens, the door moves one way only, or the motor runs without the curtain moving — so proper diagnosis avoids replacing equipment that is still serviceable.
Access Opening Solutions repairs tube motors, side-drive units, gearboxes, control panels, key switches, remotes and safety devices on commercial and industrial doors across Dublin.
Motor testing and replacement
Tube and side-drive motors tested under load before any decision to replace is made.
Limit setting and travel faults
Mechanical and electronic limits reset so the door stops correctly at both ends of travel.
Control panels and stations
Contactors, relays, inverters, push-button stations, key switches and emergency stops.
Remote controls and receivers
Re-pairing, replacement handsets, receiver faults and interference problems.
Safety circuits
Safety edges, photocells and interlocks that are stopping the door or preventing it starting.
Common faults and warning signs
What we are usually called out to
Shutter moves down but not up
Frequently a limit, contactor or control fault rather than the motor itself.
Door stops short of fully open or closed
Limits have drifted, or a safety device is intervening early.
Motor trips the supply repeatedly
Overload caused by binding guides, failed bearings or spring imbalance — resetting alone will not fix it.
No response at all from the controls
Isolator, supply, emergency stop, safety edge circuit or control station failure.
Typical causes of failure
Why these faults develop
- Running a heavy or binding curtain that overloads the motor over time
- Water ingress into external key switches, control boxes and cabling
- Vibration loosening terminals and wearing control cabling at the drive
- Spring balance never adjusted, leaving the motor carrying the full curtain weight
- Age — capacitors, contactors and limit assemblies are wearing parts
What to do immediately
Before the engineer arrives
- Stop repeatedly operating the controls; repeated attempts damage drive components and overheat motors.
- Check whether the isolator is on and whether an emergency stop has been pressed.
- Note exactly what happens: silence, humming, a click, or a motor running with no movement.
- If there is a burning smell, isolate the supply if safe and do not attempt further operation.
How we diagnose the problem
Diagnosis before parts
Replacing components without establishing the cause is how doors end up failing twice. This is the sequence our engineers work through.
- 1
Supply and isolation are confirmed first, then the control circuit is tested step by step from the station to the contactor.
- 2
The motor is tested under load; a motor that runs freely off-load can still be failing.
- 3
Drive train components — key, coupling, chain, sprockets and gearbox — are inspected before condemning the motor.
- 4
Curtain balance and guide friction are checked so a replacement motor is not fitted into the same overload condition.
Repair or replace?
Where repair makes sense — and where it does not
We recommend replacement only where continuing to repair would be unsafe, uneconomic or impossible because of part availability.
Usually repairable
- Capacitors, contactors, relays and limit assemblies
- Key switches, push-button stations and emergency stops
- Drive chains, couplings, keys and sprockets
- Remote receivers, handsets and safety edge components
Replacement usually advised
- Motors with failed windings or damaged internal gearing
- Obsolete control panels where spares are unavailable
- Motors that are undersized for the curtain they are being asked to move
Premises we serve
Types of site
- Retail units with daily-cycled shopfront shutters
- Warehouses with three-phase industrial drives
- Car park entrances and secure compounds
- Multi-tenant estates with shared access doors
- Any site where a single door failure stops access or trading
Planned maintenance advice
Preventing the next breakdown
- Correct spring balance is the single biggest factor in motor life — a balanced curtain means the motor is not fighting the door.
- External control gear should be inspected and sealed before winter.
- Limit settings drift over time; checking them during service prevents both short travel and over-travel damage.
- Recording the fault history for each door quickly reveals the ones that need a design fix rather than another repair.
Questions we are asked
Roller Shutter Motor & Control Repairs — FAQs
The motor hums but nothing moves — is the motor gone?
Not necessarily. A humming motor is often a failed capacitor, a sheared key or a broken drive chain. We test before recommending replacement.
Can you supply a replacement remote?
Yes. Handsets can usually be replaced and re-paired, or the receiver replaced where the original system is obsolete.
Why does our motor keep tripping?
Repeated tripping normally means the motor is overloaded by a mechanical problem — binding guides, worn bearings or spring imbalance. That underlying cause needs to be corrected.
Do you upgrade old control gear?
Yes, including modern control stations, safety devices and, where suitable, remote or key-switch operation.
24/7 Emergency Response
Shutter motor or controls not responding?
Describe exactly what the door does — or does not do — and we will bring the right equipment.
Call 01 877 5206Request an Emergency Call-Out
Or email info@accessopeningsolutions.com with photographs of the shutter and its location.