The Genie 27220A.S Limit Switch is a genuine OEM replacement component for select Genie garage door openers. This travel limit switch communicates the open and close positions to the opener’s control board so the motor stops precisely at the fully opened and fully closed points. Replacing a worn or failed limit switch restores accurate door travel, helps prevent over-travel, and supports smooth, reliable operation in residential applications. It’s a practical replacement part for troubleshooting issues like the door not stopping correctly, reversing unexpectedly at the ends of travel, or continuous motor run-on.
The 27220A.S typically mounts in the opener head/rail area and is actuated by the travel cam as the door moves. For compatibility, confirm the 27220A.S part number in your opener’s owner’s manual or parts diagram, or cross-reference your model with Genie’s official documentation. Installation generally involves disconnecting power, removing the opener cover, swapping the switch assembly, reconnecting the leads as originally routed, and then reprogramming or adjusting the up and down travel limits according to the manual. After replacement, test door travel, force settings, and the safety reversing system and photo-eyes. Always disconnect power before servicing and use appropriate precautions around the door and springs, or consult a qualified technician if unsure.