The Genie 33944A.S Optical Interrupt Wheel is a slotted encoder disc used on select Genie garage door openers to provide motor rotation feedback to the control board. As the wheel turns through the opener’s optical RPM sensor, it generates pulses the logic board uses to control travel distance, speed ramping, and safety reversal. Replacing a bent, cracked, or missing wheel restores accurate RPM sensing and can resolve symptoms such as inconsistent travel or the opener starting and stopping unexpectedly. This is a direct replacement part for Genie systems that originally specify 33944A.S, commonly referred to as an optical encoder wheel or RPM sensor wheel.
Installation typically involves mounting the wheel on the motor shaft inside the opener head and aligning it so its slots pass cleanly through the optical sensor. Always disconnect power before servicing the opener and follow the procedures in your model’s service manual to set alignment and proper sensor gap. After installation, verify and, if needed, reset travel limits and force settings per the manufacturer’s instructions. This replacement part is intended for Genie garage door openers that use an optical RPM sensor and list 33944A.S in their parts documentation; check your opener’s model-specific parts list for compatibility. It is frequently searched as a Genie optical interrupt wheel, Genie encoder wheel, RPM sensor wheel replacement, and garage door opener replacement part for residential applications.