Please see all our FREQUENTLY ASKED QUESTIONS below. If you do not find what you are looking for, feel free to contact us.

We will gladly assist you!

A crucial part in keeping your automated gate up and running is ensuring that it is well maintained. There are a few important factors concerning the maintenance of your gate to keep the condition up to standard.The wheels should be fitted properly to the gate and should move freely on the rail from start to end without seizing.

  • The metal rack should be properly secured to the gate with a 2mm space between the rack and the gear of the motor so that it does not press down on the motor at any time of its travel.
  • The gate rail should also be taken into consideration when looking at the maintenance of the gate.
    1. Always keep the rail clean and clear of any gravel/ground on or near its path.
    2. Make sure there is a furrow for water to get threw so that it does not build-up around the gate.
    3. Check that there are no bends on the rail where the wheels can get jammed or struggle to move and avoid any difference in height from start to end.
  • Make sure your mechanical stops are in place to prevent the gate from moving past the guide wheels and falling.
  • The stoppers that come with the gate motor kit are also very important and should not be ignored when the motor is installed.
  • Use roller guides on the gate to improve its mobility and keep the gate steady while it is being operated.
  • Try to avoid letting any insects enter the machine as they can damage the motor and cause unnecessary expenses in the future.
  • Remember not to grease any part of the gate as it will attract dirt and turn into grinding paste making a minor problem much worse.

Ensure gate is properly installed according to the instructions in the user manual. (Available on //


  1. Disengage the manual override lever (Red lever on new motors) and move the gate to the halfway position. Re-engage the override lever. Ensure that the gearbox has re-engaged by moving the gate till a clicking sound is heard and the gate cannot be moved by hand anymore.
  2. Press the test/remote control button. The gate must move to the closed position at slow speed and stop. If necessary, adjust the stopper position on the rack to ensure gate fully close.

If the gate moves to the open position on the first activation, the electrical motor direction is incorrectly set and must be reversed.
Refer to “Reversing the Electrical Motor Direction” in the respective manual for the correct procedure.

  1. The gate will remain in the closed position until activated .The gate will then move to the open position at slow speed and stop. If the stopper has been moved, disconnect the power (battery and charger). The motor will re-learn the stopper locations, and adjust stoppers accordingly.
  2. Perform an obstruction-sensing test. If necessary, refer to “Obstruction Sensitivity Adjustment” on Page 17 and adjust the obstruction sensitivity to ensure safe operation of the gate.
  3. Test the operation of the gate from inside the house by using the push button.

On the new type battery backup operator with the red lever, only Gemini remotes (Code hopping) will work on the on-board receiver, unless an extra receiver is bought and connected separately then the remotes compatible with the extra receiver will also work.

Gemini TX 1- Code Hopping.

Gemini TX 3- Code Hopping.

For the older type Gemini Operators an external receiver is used. This is plugged in or wired to the PCB. The remotes you use will depend on the type of receiver connected to the PCB.

For example a sentry receiver would require a sentry remotes/transmitters.

On the green Gemini PCB:

If the motor does not work with the battery connected and the red ‘engage’ lever properly closed.

Look at the “Status” light on the PCB if the “status” light flashes 4 times when trying to run the motor, it is a faulty reed switch.


To confirm the fault:

Press and hold the “Bypass” button on the PCB, then press the ‘test” button once. If the motor turns while holding the “bypass” button in and stops when releasing the “bypass” button, then it is definitely a faulty reed switch. Note: make sure motor is not on the Gate when doing this test seeing that it might cause damage to property if it is in the way of the gate.

The Gemini operator can be brought in for repairs at 406 Asetileen Street, Silvertonedale, Pretoria.

On the green Gemini PCB:

Check if the red LED’s are working:

  • If the “STATUS” LED or the “CHARGER” LED is working But the motor does not turn, replace the 16A fuse on the PCB and Test again.
  • If the red “CHARGER” LED is on and the 16A fuse is replaced, but the motor does not turn, it could be a faulty battery or PCB.
  • If none of the red LED’s comes on, replace the 3A fuse on the PCB and Test again.

If the STATUS red LED flashes 4x refer to the “The status light on my PC board (PCB) flashes 4 times and the motor does not turn when activated” FAQ above.

You are welcome to contact us at DMI Engineering if you have any more questions.

The Gemini operator can be brought in for repairs at 406 Asetileen Street, Silvertonedale, Pretoria.

  1. Press and release the FUNCTION button on the PCB of the Garage Door Operator (GDO) and press and release the OPEN/CLOSE button on the Wall Console. For a Gemini remote (TX) use the same procedure and press the desired button on the remote.
  2. The Wall Console/Gemini Remote is now ready for operation.


A labor charge of R240.00 is required in advance, as it covers the cost of disassembling, testing, and evaluating the motor. The client has the choice to either receive a repair quote or authorize DMI Engineering to proceed with the repair without a formal quote. If the latter option is chosen, the client will receive a quotation via email or WhatsApp. Should the client accept the quote, the R240.00 labor charge will be deducted from the total repair cost. However, if the quote is not accepted, the client will forfeit the R240.00 labor charge.

7-AH DC SLIDER 360 mm 285 mm 400 mm 14 Kg
12-AH DC SLIDER 360 mm 285 mm 400 mm 15 Kg
24V SLIDER COMPLEX-SEL 370 mm 320 mm 500 mm 20 Kg
RACK STEEL 4m 2010 mm 10 mm 55 mm 8 Kg
RACK NYLON 4m 2000 mm 50 mm 35 mm 5 Kg
DC SWING MASTER-211 440 mm 310 mm 340 mm 18 Kg
DC SWING SLAVE-212 440 mm 310 mm 340 mm 17 Kg
PEDESTAL 1040 mm 150 mm 180 mm 9 Kg
GARAGE DOOR MOTOR 400 mm 220 mm 190 mm 6 Kg
EXTRUSION-SECTIONAL 2930 mm 80 mm 120 mm 7 Kg
EXTRUSION-ROLL UP 2610 mm 80 mm 120 mm 5 Kg
EXTRUSION SECT-CARAVAN 3220 mm 80 mm 120 mm 7 Kg
EXTRUSION LONG 4220 mm 80 mm 120 mm 9 Kg
EXTRUSION TIP-UP 2610 mm 80 mm 120 mm 6 Kg
EXTRUSION ROLL UP-CARAVAN 3220 mm 80 mm 120 mm 6 Kg
ROLL UP DOOR STABILIZER 2698 mm 75 mm 50 mm 8.5 Kg
STABILIZER DOUBLE DOOR 1310 mm 65 mm 75 mm 3 Kg
STABILIZER BOX 345 mm 210 mm 200 mm 5 Kg
  • When removing your garage door motor batteries make sure that the main power source (220 V) is switched off or disconnected.
  • Remove the red link and the black and red terminals found on the batteries.
  • On the base of the motor you will find a small plastic clip holding the batteries in position. Press the clip downwards while pushing the nearest battery slightly out of its position over the clip until it is released and it can be taken out.
  • “IMPORTANT” The batteries could have swollen up and will need more effort to be taken out.
  • Once the first battery is removed you can move the second battery into the same position and follow the same steps in removing that battery.
  • When both batteries are removed you can proceed in replacing them with the new batteries. Please keep in mind the correct position of the two batteries so that the black and red connectors of the harness can fit onto the correct terminals on the batteries.
  • After the batteries are positioned accordingly the main power source can be switched on or reconnected and the “Charging” LED on the PC Board should be activated (Only on new models).
  • For any further related enquiries please feel free to contact us during business hours for assistance.
  • 012 742 3950 or Whatsapp on 072 429 4276

Please see this video below.

To enhance the speed of your sliding gate motor and upgrade it, you can follow these steps:

1. Begin by removing the circlip that holds the standard 16 Teeth pinion in place on the motor.
2. Once the circlip is removed, you can take out the pinion itself.
3. Replace the existing pinion with a 20Teeth pinion.
4. By making this simple modification, you will significantly increase the speed of your gate.

This upgrade will result in a noticeable improvement in the gate’s movement, allowing it to operate at a much faster pace than before.

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