The Allstar 103393 Up Limit Assembly is an OEM replacement limit switch assembly engineered to control the open travel stop on compatible Allstar garage door operators. By accurately signaling the opener to stop at the fully open position, this up limit assembly helps prevent over-travel, motor strain, and door damage while maintaining smooth, repeatable operation. It is commonly sought as a replacement part for troubleshooting issues such as a door that will not stop at the open point or continues to run after reaching the header. Buyers searching for an Allstar up limit switch assembly, OEM replacement, or garage door opener up travel limit component will find this part designed specifically to restore intended open-limit functionality on systems that call for Allstar part number 103393.
Installation typically involves disconnecting power to the operator, replacing the existing up limit assembly in the designated mounting location, and adjusting the open limit per the operator’s service manual to set the correct stop position. For safety, power should remain off until adjustments are complete and the travel is verified through test cycles. Compatibility is model-specific; confirm your opener’s parts diagram or documentation lists 103393 before ordering to ensure proper fit and function for residential or commercial applications that use this Allstar component.