The Genie 37958R.S Opto-Luctor Assembly is an OEM optical feedback sensor used in select Genie garage door openers to monitor motor rotation and door travel. Sometimes referred to as an RPM or encoder sensor, this assembly reads a slotted wheel on the motor or drive shaft and sends precise signals to the opener’s control board. That feedback enables accurate travel limits, smooth operation, and safety functions that stop and reverse the door when needed. Using the exact replacement part number ensures proper fit and compatibility with Genie operators designed for an opto-based feedback system.
This factory replacement is intended for residential Genie head units that employ an optical encoder. Typical symptoms of a failed or misaligned opto-luctor include the door starting and stopping unexpectedly, travel not completing, or an RPM/sensor error indicator on the opener. For installation, disconnect power, remove the opener cover, replace the sensor assembly and connector, and verify the encoder wheel path is clean and aligned with the optical slot. After replacement, follow the opener’s instructions to reset or reprogram travel limits and force. Handle the sensor carefully, keep the optics free of debris, and consult the specific Genie model’s parts list or owner’s manual to confirm compatibility before ordering this garage door opener replacement part.