Gate motor not working: start with the symptom
How the gate fails points you to the check. A gate that won't move at all, one that opens but won't close, one that stops and turns back, and one that gave up after a blackout or a cloudy week each lead somewhere different.
Fault lights differ from one motor to the next. The light patterns on this page come from CENTSYS's user guide for its V-Series swing gate motors, so if yours is another make or model, its own manual has its own codes.
Stay out of the gate's path while you check
CENTSYS's V-Series user guide says no one may cross the path of a moving gate, the motor should only be run when you can see the gate and its travel area is clear, and children should be supervised so they don't play with the gate or the motor. It also tells owners not to attempt repairs on the unit. Leave the control box closed, and leave any mains wiring to a licensed electrician.
Gate not opening: the first checks
- Power to the motor: CENTSYS asks owners to make sure the power circuit feeding the motor is switched on. Look for a tripped switch at the switchboard as well.
- A second remote or the keypad: if another one opens the gate, the gate is fine and the first remote is the problem. Our remote guide covers coin cell batteries and keeping them away from children.
- Red lights: the CENTSYS FAQ says that when a gate won't operate at all, check whether any red diagnostic LEDs stay on. Only look at what you can see without opening anything.
- A click but no movement: CENTSYS's V-Series guide says hearing a relay click while the gate stays still can mean a blown 15A motor fuse or a low battery. Both are for the door specialist.
- The gate's path: a stone jammed in a sliding gate's track, or a car or bin parked in a swing gate's arc, stops the gate as soon as it meets it.
Gate motor not closing
Look at the safety beams before anything else. The CENTSYS FAQ says that if a gate opens but won't close, check that the green IRB LED, the light for the infrared beams, is on.
CENTSYS's V-Series guide explains the behaviour. With closing beams fitted, an open gate can't close while the beam is broken, and a gate that is part way closed stops and opens again. A wheelie bin, a car's bumper or a shrub that has grown into the beam is enough to hold it open.
Repeated bumps shut the motor down as well. The same guide says that after more collisions than the default limit of 4, the controller stops and its status light flashes 4 times every 2 seconds until it receives a valid trigger. A gate that keeps meeting resistance needs a door specialist to find the cause, not another press of the remote.
What the status light on a CENTSYS V-Series means
| What CENTSYS says it means | What to do | |
|---|---|---|
| Off | The gate is closed | Nothing: this is normal |
| On, steady | The gate is open | Nothing: this is normal |
| Slow flashing | The gate is opening | Keep clear until it stops |
| Fast flashing | The gate is closing | Keep clear until it stops |
| 2 flashes every 2 seconds | No mains power is reaching it | Check the circuit to the motor is switched on |
| 3 flashes every 2 seconds | The battery has dropped below 10.6V, so the gate finishes its cycle and stops until the battery recovers | Check the power circuit, then tell the door specialist if it carries on |
| 4 flashes every 2 seconds | More collisions than the default limit of 4, so the controller has shut down | Clear whatever it hit; if it keeps happening, tell us the job |
Gate motor batteries
On some gate motors the battery does more than cover blackouts. CENTSYS says its V-Series swing motors run on a 7.2Ah battery that keeps them going through an outage, and its D5-Evo sliding motor has two 7Ah batteries as backup.
How far a battery goes depends on the gate. CENTSYS puts it at about 15 open and close cycles for a 4 to 5 metre gate during a mains failure from a 7A/H battery, with the gate's weight, friction and length moving that number, and says a larger battery allows more.
Batteries also wear out. CENTSYS says the 7Ah battery supplied with its V-Series system typically lasts up to three years, and its guide asks for battery connections that are tight and clean of corrosion. If the motor is around that age and has started stopping after power cuts, ask the door specialist to test the battery first.
A low battery shows on the V-Series as the 3 flash pattern in the table above: the controller protects the battery by letting the gate finish its run and then stopping.
Gate motor solar panel: when a solar gate stops
On a solar gate the panel does not move the gate. It charges the battery, and the battery drives the motor. CENTSYS lists a solar supply as a way to power both its D5-Evo and V-Series motors, and Merlin sells rural solar gate openers as a range of their own.
That means a solar gate that slows or quits after a run of cloud, or once winter shadows reach the panel, can be a battery that isn't getting enough charge rather than a failed motor. From the ground, look for new growth shading the panel and for dust or droppings on it. CENTSYS's six-monthly checks begin with clearing shrubs and vegetation around the gate.
Panel and battery are sized for a gate and a spot. If a solar gate has struggled since it went in, the door specialist may need to look at that sizing again. Our page on solar gate openers covers choosing one.
Opening the gate by hand
Clear the path first
CENTSYS's guide wants the gate's travel area clear before it moves, and the same goes when you push it. Keep children and pets well back.
Use your own model's release
Every maker does this its own way, so follow the steps for the motor you have. With no label or manual to go on, leave it for the door specialist.
Merlin Slide 600
Merlin's support page says to take off the small front cover, turn the key to the right and pull the lever down.
Merlin Swing L300 and Swing LR 500
Merlin says to rotate the key shield, turn the key and lift the lever.
Re-engage the motor
Merlin says re-engaging is the same steps in reverse. Then run the gate once from the remote and watch it all the way.
Grinding, groaning or a gate that drags
Merlin's support page says unusual noises from a gate may mean it needs lubrication, realigning or a new part, and sends owners to the dealer. A gate that drags also takes more out of a battery motor on every run, since CENTSYS counts friction among the things that cut how many cycles a battery gives.
For its V-Series, CENTSYS sets basic checks every six months: cut back shrubs and vegetation, keep insects and dirt out of the control housing, grease the gate hinges, and dust the manual release camlocks with graphite powder, which it prefers to oil or grease because graphite doesn't attract dust. It says to isolate the mains and disconnect the battery first. If your guide doesn't show how to do that safely, leave it for a service visit.
What to tell the door specialist
- The make and model on the motor's label, if you can read it
- Sliding or swing, and whether it runs on mains, solar or both
- What it does: nothing, a click, opens and stays open, or stops and turns back
- Any pattern in the lights, counted over a few seconds
- When it started, and whether a blackout, a storm or a grey week came first
- Roughly how old the motor is: Merlin says warranty claims on its gate openers go through the dealer who installed them
What you can do, and what to leave
You can
- Check the circuit to the motor is switched on
- Try a second remote or the keypad
- Clear the track, the swing arc and the beams
- Look over the solar panel from the ground
- Release the gate by hand, following your model's own steps
Leave to a door specialist
- Anything inside the motor or the control box
- Fuses, fault codes and limit settings
- Testing and replacing the battery
- Wheels, tracks and hinges that drag
- Faults in the mains supply, handled by a licensed electrician
What we would do
Note the date a new gate battery goes in, on your phone or on the motor's paperwork. CENTSYS says the battery supplied with its V-Series typically lasts up to three years, so when a gate about that age starts stopping after blackouts, you already know the battery is the first thing to ask about.