To identify your garage door opener, read the model label on the motor housing, then confirm the brand from the learn button color, the drive type and the photo eyes. Together those clues let you order the right gear kit, buy a remote that pairs on the first try, or tell a technician exactly what hangs from your ceiling.
Confusion often starts with a house that came with its opener: no box, no manual, and a universal remote that says nothing about the unit. This guide works from the opener itself, so lost paperwork does not matter.
Already know the brand? Our opener repair page covers the fixes, and remote and keypad programming covers adding new transmitters.
Where the label is on the motor unit
The label is almost always on the motor housing itself, under a light lens or on an end panel, and almost never on the rail or the wall button.
The Chamberlain Group, which builds LiftMaster, Chamberlain and most Craftsman openers, names three spots on its model number help page: under the front light lens, under the left lens as you face the opener, or on the side opposite the antenna wire. If the sticker you find shows a part number instead, look beneath the opposite light cover for the model.
Marantec spreads its labels around. Synergy heads carry the model number on the rear cover, and the serial hides behind the plastic light cover. M-Line and EOS heads print the model on top, while older M4500, M4700 and Q-Line units put their serial high on the side of the power head, right up by the ceiling.
Use a phone rather than your eyes. Stand on a sturdy step stool beside the rail, shoot with the flash off so the glossy label does not glare, and zoom in afterward. Under tall rafters, that photo may be the only way to read the print.
The same label usually carries a date. Federal rules have required every opener to show the month or week and the year it was built since January 1, 1991, which gives you its age at a glance and tells you whether it came before the 1993 entrapment protection rule.
What the model number format says about the brand
The format alone often names the maker: four or five plain digits suggest LiftMaster or Genie, letters first suggest Chamberlain, 139 and a period mean Sears-era Craftsman, and LDCO means Linear.
| What the label shows | Likely brand | What to check next |
|---|---|---|
| Four or five digits, sometimes ending in W, such as 8355, 8550W or 98022 | LiftMaster | Learn button color under the light lens |
| Letters first, such as B4505T, B2405T, HD420EV or RJO101 | Chamberlain | Learn button color and drive type |
| 139, a period, then more digits | Craftsman from the Sears years | Learn button color, read the Chamberlain way |
| Four digits such as 7155, 3022 or 4063, or older codes like ISD990 or ones starting IS, CM or H | Genie | Whether the rail holds a threaded rod |
| 2560 or 3560 on a Sears screw drive | A Genie-built Sears DirectLift | Order Genie parts, not Chamberlain |
| Synergy 270, 280, 370 or 380, or M4500, M4700 and EOS models | Marantec | Plus, minus and P buttons, or a row of numbered lights |
| LDCO and three digits, such as LDCO850 | Linear | A button marked LEARN on the head |
Four-digit numbers overlap, because LiftMaster and Genie both use them. A four-digit label with no readable badge needs one more clue: a threaded rod turning in the rail points to Genie, while a colored button near the antenna wire points to LiftMaster.
Learn button colors on LiftMaster, Chamberlain and Craftsman
On Chamberlain-built openers, the small colored button near the antenna wire is the learn button, and its color tells you which radio your remotes must match.
LiftMaster’s remote page points owners beneath the light cover, on whichever side the antenna hangs. Chamberlain’s compatibility lists pair each color with a radio, and the table runs from the oldest system to the current one.
| Button color | Radio system | Where it sits in the lineup |
|---|---|---|
| Green | Billion Code at 390 MHz | Older than Security+; universal remotes still list it |
| Red or orange | Security+ rolling code at 390 MHz | An earlier Security+ radio |
| Purple, sometimes looking brown | Security+ rolling code at 315 MHz | An earlier Security+ radio |
| Yellow | Security+ 2.0, at 315 or 390 MHz | The system that followed, from about 2011 |
| White | Security+ 3.0 | Current units |
Heat under the lens fades the plastic, so a button that sits between two colors deserves a daylight check against this table before you buy anything.
Color also explains why a store-bought remote fails. Chamberlain’s Clicker universal remote lists green, red or orange, purple and yellow buttons, while a white-button opener needs accessories that say Security+ 3.0 on the package.
Clues on brands that skip the colored button
Genie, Marantec, Linear and Overhead Door identify themselves through their drives, buttons, sensors and radio names rather than a color code.
- Genie: A threaded rod turning inside the rail is a screw drive, a type Genie still sells alongside its legacy screw drive lines. Genie prints Safe-T-Beam on its photo eyes and wants the beam between 5 and 6 inches above the slab. Its remotes run on Intellicode, the company’s rolling-code system.
- Marantec: A Synergy head has a tiny LCD with three programming buttons, plus, minus and P, to its right; EOS and M-Line heads show numbered lights instead. Marantec says universal remotes will not run its openers.
- Linear: The head has a button marked LEARN, and Linear remotes use MegaCode at 318 MHz, a system some universal remotes name on the package.
- Overhead Door: Overhead Door owns Genie, and its openers use CodeDodger, its own changing-code system, so look for both names on any remote’s compatibility list.
- No photo eyes: Bare jambs near the floor usually mean an opener built before 1993, whatever the badge says. Our page on older and orphaned openers covers those.
The light lens helps less. Sister brands share housings, so a Craftsman and a Chamberlain from the same year can look identical, and lens styles change from one generation to the next. Trust a name molded into the lens or printed on the end panel, and treat the lens shape as a hint, never as proof.
The rail adds a clue. Chamberlain-built ceiling units hang from one of two rail shapes, a square tube or a T profile, and the trolley differs between them, so photograph yours before ordering. A motor bolted to the wall beside the door, turning the spring tube directly, is a wall-mount opener, a style LiftMaster, Chamberlain and Genie all sell.
Remote numbers are not opener numbers
A model number printed on a remote identifies the remote, so it will never match a gear kit or a logic board to your opener.
Brands number their transmitters separately. Genie’s support library lists remotes such as the G3T-BX, GITR-3 and GIT-1, Chamberlain sells the CH363 and the Clicker, and LiftMaster’s 893MAX covers that brand’s openers back to 1993. A sticker showing any of those describes the remote in your hand, not the motor on the ceiling.
The remote is still useful evidence. The brand is usually molded on the face and the model sits on the back or under the battery door. A row of eight to twelve tiny switches in there marks a fixed-code transmitter from before rolling code, which hints at the opener’s age too.
A universal remote on your visor, or the HomeLink buttons built into a car, can run openers from several makers, so it proves nothing about the brand. Once you know the unit, our HomeLink, keypad and remote programming guide covers pairing.
A five-minute routine that identifies almost any opener
Photograph the motor unit, the label under the lens, the drive, the photo eyes and the remote, then note the date, with only a step stool and a phone and your hands nowhere near the moving rail.
- Close the door and leave the opener plugged in. You are only looking. If the light is on, let the bulb cool before you touch the lens.
- Photograph the whole motor unit from below. Get both ends and the side facing the door, so the badge and any stickers show.
- Open or look under the light lens. Most lenses swing down or unclip. Photograph the label plus the learn button or programming buttons.
- Check the side away from the antenna wire. If the first sticker showed only a part number, the model is probably here.
- Name the drive. Chain, belt, a threaded rod, or a motor on the wall turning the spring tube.
- Check the sensors mounted low on both jambs. Note any name printed on them, or the fact that there are none.
- Photograph the remote front and back, then inside the battery door.
- Write down the date on the label. It sets up any repair or replace decision that follows.
When the label is missing or unreadable
A missing label slows the search but rarely stops it, because the learn button, drive, photo eyes and remote together usually point to one maker.
Labels vanish in predictable ways in older Portland garages: paint overspray from a ceiling refresh, years of damp in an uninsulated detached building, or a previous owner who peeled the sticker. When that happens, shoot every photo in the routine above and send the set to us. The combination usually settles the brand.
Age matters as much as brand. A unit with neither photo eyes nor a date stamp likely predates the 1991 labeling rule and the 1993 safety standard, and our guide on whether to repair or replace an opener explains why those usually come down instead of getting new parts.
Once you know the maker, each brand page goes deeper: LiftMaster, Chamberlain, Craftsman, Genie, Marantec and Linear. Text us the photos from the routine and we will confirm the model, check which parts are still sold, and tell you whether a repair is worth booking.