The Genie 34538R.S Up Limit Switch is a genuine OEM replacement for Genie Chain Glide garage door openers that use magnetic travel limits. This magnetic “Up” limit switch mounts on the opener rail and is triggered by the carriage magnet to signal the control board when the door has reached the fully open position. A failing or misaligned up limit switch can cause the door to overrun, stop short, or cycle unexpectedly; replacing it restores proper travel control and helps ensure the opener stops consistently at the correct open height.
Designed specifically for Genie Chain Glide systems with magnetic limits, the 34538R.S connects to the opener’s low-voltage limit circuit and works with the existing trolley magnet—no changes to remotes or safety sensors are required. For installation, disconnect power, position and secure the switch on the rail at the proper location, plug the connector into the opener’s limit harness as directed by the owner’s manual, and fine-tune the open limit as needed. After replacement, test door balance, travel, and safety reversal. This factory part is the recommended replacement for homeowners or technicians servicing Genie Chain Glide openers seeking a reliable, compatible up travel limit switch.