One of the most common automatic gate problems is a gate that opens normally but refuses to close.

You press the remote and the gate opens without a problem. But when you try to close it, nothing happens, the gate starts closing and then reverses, or it closes only when operated manually.

In many cases, this does not mean that the gate motor has failed.

Automatic gates have safety systems designed to prevent the gate from closing when an obstruction is detected. Photocells, control-board inputs, limit switches, wiring and mechanical components can all affect the closing cycle.

Before replacing the motor, the actual cause needs to be identified.

For automatic gate repair in Kenya, call or WhatsApp +254 722 708034 / 0720 456534 or visit www.automaticgates.co.ke.

Why Does My Automatic Gate Open but Not Close?

If the gate opens but will not close, the first areas to investigate are:

• Safety photocells
• Obstructions around the gate
• Photocell alignment
• Photocell wiring
• Control-board safety inputs
• Gate limit switches
• Gate alignment
• Track and roller condition
• Remote-control operation
• Battery and power supply
• Automatic closing settings
• Mechanical resistance

The exact cause depends on the type of gate, motor and symptoms.

For example, a gate that refuses to close immediately may have a safety sensor problem, while a gate that starts closing and then reverses may have an obstruction, mechanical resistance or safety-input issue.

1. Check the Automatic Gate Photocells

Photocells are one of the first things to check when an automatic gate opens but will not close.

Photocells are safety sensors positioned on opposite sides of the gate opening. They create a beam across the entrance.

If the system detects that the beam is interrupted, the control board can prevent the gate from closing or cause it to stop and reverse.

This is an important safety feature.

If the photocell is dirty, damaged or incorrectly aligned, the gate may think that something is blocking the entrance even when the path is clear.

Need help with automatic gate photocells? Call +254 722 708034 / 0720 456534.

2. Clean the Photocell Lenses

Dust, dirt, insects, cobwebs and other debris can interfere with a photocell.

This is particularly relevant for gates installed outdoors where the sensors are exposed to weather and general environmental conditions.

Look at both photocell units and check whether their lenses appear dirty or obstructed.

A clean, unobstructed sensor is important for reliable operation.

However, if cleaning does not solve the problem, the sensor may be misaligned, damaged or experiencing a wiring or control-system fault.

3. Check Photocell Alignment

The two photocell units need to face each other correctly.

If one sensor has been knocked, moved or shifted, the beam may no longer line up properly.

This can happen after:

• A vehicle contacts the sensor
• Landscaping work is carried out
• The mounting post moves
• The sensor housing becomes loose
• Someone accidentally knocks the unit
• The gate entrance is modified

A misaligned photocell can cause the gate to behave as though an obstruction is present.

The photocell should be properly aligned rather than simply bypassed.

4. Is Something Blocking the Gate?

Check the complete gate opening.

Look for:

• Vehicles
• Bicycles
• Rubbish bins
• Stones
• Branches
• Plants
• Children’s toys
• Other objects
• Anything crossing the photocell beam

Even a small object can trigger a safety system depending on its position.

For sliding gates, also check the area along the gate’s travel path.

For swing gates, check the complete swing arc.

If you cannot identify the problem, send a short video to +254 722 708034 / 0720 456534 for automatic gate troubleshooting.

5. The Photocell Wiring Could Be Faulty

The problem is not always the sensor itself.

The wiring connecting the photocells to the gate control board can also develop problems.

Possible causes include:

• Loose connections
• Damaged cable
• Water ingress
• Corrosion
• Incorrect connections
• Physical damage
• A failed photocell

If the photocell looks clean and correctly aligned but the gate still refuses to close, the wiring and control inputs may need to be checked by a technician.

6. The Gate May Be Detecting an Obstruction

Modern automatic gate systems can have more than one method of detecting an obstruction.

In addition to photocells, many systems use motor current or force detection.

If the motor detects unusual resistance while closing, the control system may stop or reverse the gate depending on its configuration.

This can happen if:

• The gate is difficult to move
• The track is obstructed
• Rollers are worn
• The rack is misaligned
• The gate has become damaged
• Something is physically interfering with movement

The control system may therefore be responding correctly to a mechanical problem.

7. Check the Sliding Gate Track

If you have a sliding automatic gate, inspect the track.

Dust, stones, leaves and other debris can build up over time.

A dirty or damaged track can make the gate harder to move, particularly toward one section of its travel.

If the gate opens but struggles during closing, the track should be inspected.

The guide rollers should also be checked.

A gate should be able to move smoothly without excessive resistance.

For sliding gate repair and maintenance in Kenya, contact Premier Automatic Gates Systems on +254 722 708034 / 0720 456534.

8. Worn Gate Rollers Can Cause Closing Problems

Sliding gates depend on rollers to move along the track.

Over time, rollers can wear or develop mechanical problems.

You may notice:

• Grinding noises
• Jerky movement
• Gate movement becoming slower
• Gate vibration
• Uneven movement
• The gate stopping at certain points

If the gate becomes difficult to move, the automatic motor has to work harder.

The motor may then respond to the additional resistance as an obstruction.

Replacing or servicing the rollers may therefore solve a problem that initially appeared to be a motor fault.

9. Check the Gate Rack and Pinion

The rack and pinion transfer movement from the motor to the sliding gate.

If the rack is damaged, loose or incorrectly aligned, the gate may not move correctly.

Possible symptoms include:

• Motor runs but gate movement is poor
• Grinding or unusual mechanical noise
• Gate movement becomes uneven
• Gate stops at a particular point
• Gate moves in one direction but struggles in another

The rack should be properly aligned with the motor pinion throughout the gate’s complete travel.

10. The Gate Limit Switch May Need Attention

Automatic sliding gates use travel limits to determine where the gate should stop.

If a limit switch or associated travel setting is incorrect, the control system may not correctly recognise the fully open or fully closed position.

This can result in unusual behaviour such as:

• Gate stopping too early
• Gate travelling too far
• Gate refusing to complete its closing cycle
• Gate reversing unexpectedly

Limit-switch and control-board adjustments should be carried out correctly rather than guessed.

For automatic gate troubleshooting in Nairobi and Kenya, call +254 722 708034 / 0720 456534.

11. The Automatic Closing Function May Be Disabled

Some automatic gate systems have an automatic closing function that can be configured or disabled.

If your gate opens but does not close automatically, the system settings may need to be checked.

However, if the gate previously closed automatically and has suddenly stopped doing so, do not assume that the setting has simply changed.

A safety input or another fault could be preventing the closing command.

The control board should be checked to determine why the closing cycle is not being completed.

12. The Remote Control May Not Be the Problem

If the gate opens successfully from the remote, the remote is probably communicating with the gate system at least for that command.

However, if you have separate buttons or controls for opening and closing, or if the system has additional access-control equipment, the control inputs may still need to be investigated.

The important thing is to describe exactly what happens:

Does the gate open but do absolutely nothing when you press close?

Or:

Does it begin closing and then reverse?

Or:

Does it close manually but not automatically?

These different symptoms can point toward different areas of the system.

For automatic gate repair diagnosis, WhatsApp a short video to +254 722 708034 / 0720 456534.

13. What If the Gate Starts Closing Then Opens Again?

This is another common symptom.

The gate starts moving toward the closed position but suddenly stops and reverses.

Possible causes include:

• Photocell interruption
• Misaligned safety sensors
• Obstruction
• Excessive mechanical resistance
• Gate alignment problem
• Safety settings
• Control-board fault

The gate should be observed carefully while operating.

If it reverses at exactly the same position each time, there may be a physical or mechanical issue at that point.

If it reverses at different points, a safety sensor, electrical or control issue may be more likely.

A technician can test the system and identify the cause.

14. What If the Gate Closes Manually but Not Automatically?

This is useful information when diagnosing the problem.

If the gate can be released from the motor and moved manually without excessive resistance, the mechanical system may be reasonably free.

If it is very difficult to move manually, the gate itself may have a mechanical problem.

If it moves smoothly manually but the automation refuses to close, attention can then be directed toward the motor, control board, safety devices, limit settings and associated wiring.

This is why a proper diagnosis considers the whole gate system, rather than automatically assuming the motor is faulty.

15. Could a Low Battery Cause the Gate Not to Close?

Yes, depending on the system and its condition.

Automatic gate motors may use batteries for backup power, particularly where the property experiences power interruptions or uses solar-assisted automation.

A weak battery can affect motor operation.

If the gate behaves differently when mains power is available compared with when it is running from battery backup, the battery and charging system should be investigated.

Battery condition is particularly important for properties that depend on the gate during power outages.

Need automatic gate battery testing or replacement? Contact us on +254 722 708034 / 0720 456534.

16. What About Power Problems?

A gate automation system needs a reliable power supply.

Electrical faults, tripped breakers, damaged wiring or problems with the power supply can affect normal operation.

A power-related problem may not always completely shut down the gate.

You may experience intermittent or unusual operation instead.

If your automatic gate behaves differently at different times, the power supply and backup battery should be included in the diagnosis.

Electrical work inside the control system should be handled by a suitably qualified technician.

17. Centurion D5 Evo Opens but Won’t Close

If your Centurion D5 Evo opens but refuses to close, start by looking at the safety system.

Photocells are one of the first areas to inspect.

Check whether:

• The photocell lenses are clean
• The sensors face each other
• Nothing is blocking the beam
• The sensor housings have moved
• The wiring appears intact

The gate’s mechanical movement should also be assessed.

A D5 Evo that is working correctly should not be assumed to require replacement simply because it refuses to close.

The fault could be repairable.

For Centurion D5 Evo repair in Kenya, call +254 722 708034 / 0720 456534.

18. Centurion D6 Smart Opens but Won’t Close

The same basic diagnostic approach applies to a Centurion D6 Smart.

Check the safety sensors, gate movement, power, battery and control system.

If the D6 Smart opens normally but refuses to close, a safety input may be preventing the closing cycle.

If the gate begins closing and reverses, the system may be detecting an obstruction or excessive resistance.

The exact cause should be established before replacing the motor or control board.

Premier Automatic Gates Systems provides Centurion gate motor troubleshooting, repair, servicing and replacement services in Kenya.

19. What About Swing Gates?

The diagnosis is slightly different for a swing gate because there is no sliding track.

Instead, attention may be given to:

• Hinges
• Gate alignment
• Operator arms
• Mechanical resistance
• Photocells
• Control board
• Limit settings
• Power supply
• Safety inputs

The complete swing path should be clear.

A swing gate that starts closing and then reverses may be responding to a safety input or detecting unusual resistance.

For swing gate automation repair in Kenya, call +254 722 708034 / 0720 456534.

20. Don’t Bypass the Safety Photocells

It can be tempting to bypass a safety sensor simply to make the gate close.

That is not a good long-term solution.

Photocells are part of the gate’s safety system. They are intended to help prevent the gate from closing when something is detected in its path.

If the photocells are faulty, they should be properly repaired, realigned or replaced.

Premier Automatic Gates Systems identifies photocell safety beams and anti-crush/auto-reverse functions as important parts of automatic gate safety.

What Should You Check Before Calling a Gate Technician?

There are a few simple observations you can make without opening the control board.

Check 1: Is the gate receiving power?

Look for the normal power indicator or warning light.

Check 2: Is the gate opening normally?

If yes, tell the technician.

Check 3: Does it start closing?

If it starts and then reverses, mention this.

Check 4: Are the photocells clean?

Check for visible dirt, cobwebs or obvious obstructions.

Check 5: Is anything blocking the gate?

Check the complete gate opening and travel path.

Check 6: Does the gate move freely?

If it is a sliding gate, note whether it can move smoothly.

Check 7: Has anything changed recently?

For example:

• Vehicle hit the gate
• Power interruption
• Landscaping work
• Heavy rain
• Gate modification
• New access-control system
• Motor servicing

These details can help a technician understand what happened.

If you are still stuck, send a short video to +254 722 708034 / 0720 456534.

Send Us a Photo or Video of the Problem

You do not need professional equipment.

A phone video can show useful information about what the gate is doing.

If possible, send:

• A video of the complete gate
• A close-up of the motor
• What happens when you press the remote
• Any unusual motor sound
• The photocells
• The gate track
• The rollers if visible
• Warning lights or error indicators

Premier Automatic Gates Systems specifically recommends sending photos or short videos when a gate is stuck or behaving unexpectedly, because the information can help narrow down the likely fault before a site visit.

WhatsApp your gate video to +254 722 708034 / 0720 456534.

When Should You Call a Gate Technician?

You should arrange professional assistance when:

• The photocells appear faulty
• The gate repeatedly reverses
• The motor makes unusual noises
• The gate is mechanically difficult to move
• The control board shows an error
• The gate has intermittent faults
• Wiring appears damaged
• The motor does not respond
• The gate has suffered physical damage
• You suspect a control-board or electrical fault

Do not keep operating a gate that is behaving unpredictably.

Automatic gates are moving systems, so faults involving safety devices, control boards or mechanical components should be properly assessed.

Automatic Gate Repair in Nairobi and Kenya

Premier Automatic Gates Systems provides automatic gate repair, servicing, troubleshooting and replacement for residential and commercial properties.

We work with Centurion and other major gate automation systems and can investigate problems involving:

• Gate motors
• Batteries
• Remote controls
• Photocells
• Control boards
• Wiring
• Racks
• Rollers
• Tracks
• Gate alignment
• Access-control equipment
• Sliding gates
• Swing gates

If the existing motor is repairable, we can diagnose the fault and repair the system.

If the automation is old, unreliable or no longer suitable for the gate, we can also assess replacement and upgrade options.

For automatic gate repair in Kenya, call or WhatsApp +254 722 708034 / 0720 456534.

Frequently Asked Questions

Why does my automatic gate open but not close?

A safety photocell problem is one possible cause. Other possibilities include obstructions, misalignment, mechanical resistance, limit-switch issues, wiring problems, power problems or control-board faults.

Why does my automatic gate close then open again?

The system may be detecting an obstruction or unusual resistance. Photocells, gate alignment, rollers, track, rack and safety settings should be checked.

Why won’t my Centurion gate close?

Check the safety photocells and the gate’s mechanical movement. A faulty or misaligned safety device can prevent closing.

Can a dirty photocell stop my gate from closing?

Yes. Dirt or an obstruction on the sensor can interfere with the safety beam and cause the automation system to prevent closing.

Can a misaligned photocell cause a gate to reverse?

Yes. If the safety system detects an interrupted beam, the gate may stop or reverse according to its programmed safety operation.

Does an automatic gate need photocells?

Photocells are an important part of the safety system on many automatic gate installations. They should be correctly installed, aligned and maintained.

Should I replace my gate motor if it won’t close?

Not necessarily. The problem may be a photocell, wiring, battery, mechanical issue, limit setting or another component. Diagnosis should come before replacement.

Can you repair a Centurion D5 Evo that opens but won’t close?

The system can be assessed to identify whether the problem is related to photocells, wiring, battery, mechanical movement, control components or another fault.

Can you repair a Centurion D6 Smart that won’t close?

Yes, the system can be assessed for possible safety, mechanical, electrical and control-system faults.

Can I send a video of my gate problem?

Yes. A short video can help show what happens when you operate the gate and can help identify what needs to be investigated.

Automatic Gate Opens but Won’t Close? Get It Checked

If your automatic gate opens normally but refuses to close, do not immediately assume that the motor needs replacing.

Start by checking the obvious causes: photocells, obstructions and the gate’s mechanical movement.

If the problem continues, the control system, wiring, battery, limit settings and other components may need professional diagnosis.

Premier Automatic Gates Systems provides automatic gate repair, troubleshooting, maintenance, replacement and upgrade services in Kenya.

Call / WhatsApp: +254 722 708034 / 0720 456534

Website: www.automat