Gemini gate motor repairs and installation

Gemini's sliders share an oil-filled worm-drive gearbox and a 17-tooth pinion; what changes is the motor, the battery and how heavy and busy a gate each is built for.

Gemini also makes garage door operators for sectional, tip-up and roll-up doors, an older AC slider, a complex receiver and wireless safety beams. The settings and wiring for each are on the Gemini manual page.

A Gemini has no display. Its behaviour is set on the control card with DIP switches and a small dial:

• Auto-close: four DIP switches choose a delay from 2 to 60 seconds, or off. Taking the auto-close loop off the connector block switches it off whatever the switches say.
• Obstruction sensitivity: a dial on the card. Clockwise makes the gate less sensitive, anticlockwise more.
• Motor direction: one DIP switch, set by which side of the gate the motor stands on, seen from inside the property facing the road.
• Townhouse function: ignores every command except the beams and obstruction sensing while the gate is opening and waiting to close.
• Remotes: the on-board receiver holds 30. When it's full, its LED flashes five times and nothing more can be added until the memory is cleared.

Every one of these lives on the control card under the cover, beside the battery and the power connections, so we set them on site.

A Gemini's status light, and its buzzer if one is fitted, flash in groups that point to the fault: two for a mains supply problem, three for a low battery, four when the motor is triggered with the release lever not engaged or a faulty reed switch, and a single flash about five seconds after closing when the gate hasn't fully closed. The full list, with what to check for each, is on Gemini gate motor problems.

Beyond those, Gemini's maintenance notes point at the gate itself:

• wheels that seize on the track, or a gate running without roller guides
• a rack sitting on the pinion instead of 2 mm above it
• missing end stoppers, which Gemini says must never be left off
• insects, water, mud and sand inside the motor

The pulse sensor, which counts the motor's turns so the card knows where the gate is, is a part that can be replaced on its own. All our spare parts are genuine, and every repair carries our six-month guarantee on our repairs.

Every Gemini slider runs from its battery, which the mains keeps charged, so it carries on through a power cut. The spec sheets give a 12 V 8 Ah battery for the Slider 500 and two for the 24 V sliders, and Gemini's openings-a-day figures assume a gate that needs less than half the motor's full force: a stiff gate and a tired battery give fewer.

The sliders are listed as solar compatible and GSM compatible, and work with Gemini's Gemlink Smart, which comes with the 24 V Slider 600 and 800. If you want the gate on solar power or opened from a phone, tell us on the job card and we'll quote for it.

Gemini's 24 V garage door operator is built for homes: Gemini rates it for about 20 openings a day, it runs on two small 12 V batteries through a power cut, and its obstruction sensing is set separately for opening and closing. The newer limit-learning roll-up operator is for single roll-up doors no wider than 2,550 mm.

As with any garage motor, the door has to be balanced and run freely by hand first. If it doesn't, the motor stops or reverses as if something were in the way, and the fix is the door: see garage door repairs.

Our installed Gemini kit, with what's in the box:

For comparison, typical South African shop prices without installation:

Prices checked October 2026. Repairs are priced on site. Your exact price is set in a free quote before any work starts. No call-out fee when we do the work. If no work is done, a R650 call-out fee applies.

Repairs Plus is an independent installer and repairer. We are not the manufacturer.