LiftMaster Safety Sensor Eyes & Brackets
LiftMaster Safety Sensor Eyes and Brackets
The safety sensors are the two eyes mounted near the bottom of the door track. If the door will not close, or closes a few inches and reverses, the sensors are the first thing to check — and most of the time nothing is broken.
Before you buy anything, check the lights.
- Both eyes lit and steady — the sensors are fine. The fault is elsewhere.
- One eye off or flickering — usually alignment. Loosen the wing nut, move the eye until the light is steady, retighten.
- One eye blinking steadily — the two eyes are not seeing each other. Check for a cobweb, a bin, a coiled hose, or sunlight hitting the receiving eye.
- Sunlight is the usual culprit in the afternoon — that is what the sunblocker bracket exists for.
- Neither eye lit — check the wire. Staples through the insulation are the most common cause; the 2 conductor bell wire is cheap to replace.
- Still blinking after all that — then replace the eyes, and replace them as a pair.
1. Sensor Eyes — Order These
First part of number below corresponds to diagram number above:
| Ref | Part # | Description |
|---|---|---|
| S1–S2 | 041-0136 | Safety sensor eye kit — sending and receiving eyes, supplied as a matched pair |
| — | 041-0365-000 | Sensor eyes and brackets, 1997 to current — the complete set |
Which one do you need? If your brackets are sound and only the eyes have failed, the 041-0136 is all you need. If the brackets are bent, rusted or missing, the 041-0365-000 includes both and works out cheaper than buying them separately. The 041-0136 fits every LiftMaster opener from 1993 to current — you do not need to match your old part number.
2. Brackets and Mounting
| Ref | Part # | Description |
|---|---|---|
| S3–S4 | 041A5281-1 | Extension brackets — replaces 12B484 and 12B485 |
| S6 | 041-0155-000 | Safety sensor brackets, 2021 to present |
| — | 041B0873 | Sunblocker bracket — stops sunlight false-tripping the receiving eye |
| — | Sensor Guards | Protective guards — sensors not included |
If the door gets knocked regularly — a bike, a bin, a car door — the sensor guards cost less than one replacement eye kit and stop it happening again.
3. Wire and Hardware
| Ref | Part # | Description |
|---|---|---|
| 06 | 041B4494-1 | 2 conductor bell wire, 26 ft — white and white/red |
| — | 041A2770-17 | Installation hardware kit — includes sensor bolts and staples |
Sensor wire is low voltage two conductor bell wire. When you staple it, staple beside the wire rather than through it — a staple driven through the insulation shorts the pair and produces exactly the same blinking symptom as a failed eye.
4. Superseded Part Numbers
The current eyes and brackets replace every earlier version, so there is no need to match your old part number — order the current part from the tables above.
| Old Part # | Order Instead | Notes |
|---|---|---|
| 41A5034 | 041-0136 | Eye kit used 1997 onward, now superseded |
| 12B484 | 041A5281-1 | Square holed mounting bracket, discontinued |
| 12B485 | 041A5281-1 | Slotted mounting bracket, discontinued |
| 041A5266-1 | 041-0155-000 | Sensor mounting bracket, no longer available |
A Note on Safety
The safety sensors are a legal requirement on every residential garage door opener sold in the United States since 1993, and they are the only thing stopping the door closing on a child or a pet. Do not bypass them. Twisting the wires together to stop the beeping disables the reversing system entirely. If the sensors will not behave, replace them — a new eye kit costs a fraction of what the alternative could.
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