The LiftMaster 041-0136 Safety Sensor Kit is a replacement set of photoelectric safety reversing sensors designed for LiftMaster, Chamberlain, and Craftsman garage door openers that use standard two‑wire safety eyes. When installed and aligned on both sides of the door opening, the infrared beam safeguards closing: if the beam is obstructed, the opener will stop and reverse to help prevent injury or damage. This kit is commonly used to restore proper operation when a garage door won’t close from the remote and the opener lights flash due to a sensor fault. It replaces legacy kit 041A5034 and is compatible with most residential openers manufactured after 1997 that are equipped for Safety Reversing Sensors (not for models that never supported photo eyes).
The kit includes the sending and receiving sensors with mounting brackets and hardware. The sensors are powered by the opener’s low-voltage circuit and wire to the designated sensor terminals (polarity matters; follow your model-specific manual). For correct operation, mount each sensor facing the other on the door tracks or wall within 6 inches of the floor, then align until the indicator LEDs show a solid status—amber on the sending sensor indicates power, and green on the receiving sensor confirms alignment. Keep the lenses clean and routing secure, and never bypass or install higher than recommended. This OEM LiftMaster replacement part supports residential sectional door applications that require compliant infrared safety beams and maintains compatibility across many Security+ and Security+ 2.0 openers that use the standard two‑wire sensor interface.