Garage Door Opener Safety Sensors - Safety Sensors

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Replacement garage door sensors (safety reversing sensors, also called photo eyes) for LiftMaster, Chamberlain, Craftsman, Genie, Linear, Sommer, Marantec, Hormann, Allstar and Wayne Dalton openers, plus commercial photo eyes. The two sensors sit about 6 inches above the floor on each side of the door. One sends an invisible beam to the other, and if anything breaks the beam while the door is closing, the opener stops and reverses.

Door won’t close or the opener lights blink? Check the sensor lights first. Usually the sensors are just misaligned, dirty or have a loose wire, and nothing needs replacing. The guide below the products shows what each light colour means and how to align them. If a sensor is cracked or stays dark with good wiring, replace it with the sensor kit made for your opener brand: for example the LiftMaster 041-0136 fits LiftMaster, Chamberlain and Craftsman openers made since 1997.

Step by step for every brand: how to fix garage door sensors (light colors, alignment, wiring test). Opener won't run at all? Garage door won't open.

Also here: sensor brackets and sensor guards that protect the eyes from cars, bikes and brooms.

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What the sensor lights mean

Sensor lights	What it means
LiftMaster / Chamberlain / Craftsman: amber and green both steady	Normal. Amber = sending sensor, green = receiving sensor.
Green LED blinking	Misaligned or something is blocking the beam.
Amber on, green off	Wiring problem at the receiving sensor.
Both off	Wiring problem at the sending sensor, or no power to the opener.
Genie Safe-T-Beam: red and green both steady	Normal. Red = sending, green = receiving.
Red blinks 2 times	Misaligned or blocked.
Red blinks 3 times	Interference, often direct sunlight.

LiftMaster openers also flash a code: the LEARN button flashes 4 times every 10 seconds, or the up arrow flashes 4 times and the down arrow 6 times, when the sensors are blocked or misaligned.

How to align garage door sensors

Clear anything in the beam and wipe both lenses.
Loosen the wing nut on the receiving sensor (green LED).
Point the two lenses straight at each other until the green LED glows steady, then tighten the wing nut.
Test: close the door with a 2x4 laid flat in the doorway. The door must reverse when it touches it.

Mount the beam no higher than 6 inches above the floor. If sunlight hits the receiving sensor, swap the two sensors to opposite sides of the door or add a sun shield.

Replacement sensors by brand

Opener brand	Sensors and parts
LiftMaster / Chamberlain / Craftsman	041-0136 sensor kit, brackets, extension brackets, sun shield
Genie	GSTB-BX Safe-T-Beam kit, Series II extension kit
Linear / Sommer / Marantec	HAE00087, Sommer 7012V001, Marantec 97246
Hormann / Allstar / Wayne Dalton	EL201, Allstar 108994, 252118
Commercial operators	LiftMaster CPS-U and more monitored photo eyes

Protect sensors from bikes and bins with Sensor Guards. Need new wire? See opener wire. Questions? Call 877-379-4947.

More help: full garage door sensor guide · door won't open · reset the opener.

Frequently Asked Questions

How do I fix my garage door sensors?

Most sensor problems are alignment, dirt or wiring. Clear anything in the beam, wipe both lenses, then loosen the wing nut and point the sensors at each other until both LEDs glow steady. If an LED stays off, check the wire for breaks or loose connections. If nothing helps, replace both sensors as a set.

Why is my garage door sensor light yellow?

On LiftMaster, Chamberlain and Craftsman openers, the sending sensor has an amber (yellow-orange) LED. A steady amber light is normal. The receiving sensor's LED is green: if it blinks or is off, the sensors are misaligned, blocked or have a wiring problem.

Why is my garage door sensor blinking red?

On Genie openers the sending Safe-T-Beam has a red LED. Two blinks with the green LED on mean the beam is misaligned or blocked. Three blinks mean interference, often from sunlight. A steady red and steady green is normal.

Can I bypass garage door sensors?

Don't disable them: the sensors are a required safety device that stops the door from closing on people, pets or cars. To close the door until you fix them, press and hold the wired wall button until the door is fully closed. Holding the button overrides the sensors only while you hold it; remotes and keypads won't close the door.

Are garage door sensors universal?

No. Replace sensors with ones made for your opener brand. Genie, for example, says to use only Genie Safe-T-Beams on its openers. Commercial operators and gates use their own photo eyes too.