Garage Door Opener Safety Sensors
If your door reverses, won't close, or the opener lights blink, the safety sensors (photo eyes) are the most common cause. These infrared eyes mount near the floor on each side of the door and stop it from closing on an obstruction. We stock OEM replacement safety sensors and photo-eye sets for LiftMaster, Chamberlain, Genie, Linear and more.
Blinking lights = sensor issue. Before replacing, check that the two sensors face each other, are wired correctly, and have clean lenses — a steady indicator light on both means they are aligned. Persistent blinking after cleaning and alignment usually means a sensor or wire has failed.
Wiring or board trouble instead? See opener circuit boards, or browse all garage door opener parts.
Genie GSTB-BX Safe-T-Beam KitSKU: GSTB-BX$48.96 As low as $44.06Genie GSTB-BX Safe-T-Beam Kit: replacement photo-eye…
Sommer 7012V001 Safety Sensor KitSKU: 7012V001$49.28 As low as $44.35Includes: Pair of safety sensors, Pair of 32' 9" wires,…
Liftmaster Cps-Un4 Industrial Photo Eyes Nema 4 Commercial SafetySKU: CPS-UN4$213.64 As low as $192.28LiftMaster CPS-UN4 Industrial Photo Eyes — NEMA 4…
Marantec M8-705 Safety Sensor Kit 97246SKU: 97246$54.01 As low as $48.61Genuine Marantec M8-705 Safety Sensor Kit (part no. 97246)…
Allstar 108994 All Clear Photo Eye KitSKU: 108994$77.94Compatible with all Allister, Allstar and Challenger…
LiftMaster 041-0136 Safety Sensor KitSKU: 041-0136$38.21 As low as $34.39LiftMaster 041-0136 Safety Sensor Kit (OEM) — infrared…
Hormann EL101 Photo Eye SetSKU: EL101$34.42 As low as $30.98Hörmann EL101 Photo Eye Set: infrared through-beam…
Digi-Code CR2149 Universal Safety Beam SensorsSKU: CR2149$43.57Digi-Code CR2149 Universal Safety Beam Sensors for garage…
LiftMaster 41B873 Safety Sensor Sun ShieldSKU: 41B873$28.15 As low as $25.34LiftMaster 41B873 Safety Sensor Sun Shield reduces direct…
Sensor Guards for Garage Door Opener Safety SensorsSKU: SENSORGUARDS$34.95Come as pair Optional mounting hardware…
Omron Sensor E3K-R10K4-NR Photo Eyes Retro-Reflective Nema 4 ExteriorSKU: E3K$154.62 As low as $139.16Omron E3K-R10K4-NR retro-reflective photo eye sensor with…
LiftMaster CPICARD Conversion Interface CardSKU: CPICARD$75.74 As low as $68.17LiftMaster CPICARD Conversion Interface Card enables…
LiftMaster LMTBUL Monitored Through-Beam Photo Eyes with HeaterSKU: LMTBUL$360.51 As low as $324.46Maximum Detection Range: Provides a powerful through-beam…
Genie 34439R.S Series II STB Extension KitSKU: 34439R.S$10.13 As low as $9.12Extends Genie Safe-T-Beam sensors outward from the door…
Liftmaster Cps Commercial Protector System Photo Eye Kit InterfaceSKU: CPS$203.27 As low as $182.94LiftMaster CPS Commercial Protector System Photo Eye Kit…
LiftMaster CPSIII-UN4 Sensor and Card KitSKU: CPSIII-UN4$296.38 As low as $266.74Compatible with LiftMaster models: CPS3, CPS4, and…
Liftmaster CPS-RPEN4 Monitored Retro-Reflective Photo Eye SafetySKU: CPS-RPEN4$132.71 As low as $119.44Monitored retro-reflective photo eye safety sensor…
LiftMaster 041-0155-000 Safety Sensor BracketsSKU: 041-0155-000$18.37 As low as $16.53OEM replacement LiftMaster 041-0155-000 Safety Sensor…
Liftmaster Cps-Open4 Monitored Dual-Sided Photo Eyes Nema 4X SensorSKU: CPS-OPEN4$74.12 As low as $66.71Monitored dual-sided photo eyes for commercial/industrial…
Genie 37909S Series III STB Extension KitSKU: 37909S$29.06 As low as $26.15Special OrderWhat does this mean?Compatible with Genie garage door opener Safe-T-Beam…
Diagnosing Photo-Eye Problems
Garage door safety sensors are required by law on every residential opener made since 1993. When they fail or misalign, the opener refuses to close the door (so it can't crush anything) and signals the fault by blinking its lights or beeping. Most issues are alignment or dirt, but sensors do wear out.
- Both LEDs solid: sensors are aligned and working.
- One LED off or flickering: realign the brackets until both lights are steady.
- Still blinking after alignment: clean the lenses, check for cut/pinched wires, then replace the sensor set.
- Sun glare in the lens can cause false trips — shade or reposition the affected eye.
Replace sensors as a matched pair (sending + receiving eye) and match them to your opener brand — LiftMaster/Chamberlain and Genie systems use different sensors and are not interchangeable.
Need help diagnosing? Call 877-379-4947 with your opener model and the blink pattern.
