LiftMaster K23-2016 Open / Close Limit Switch — Documented Operator Controls

The LiftMaster K23-2016 is the open/close limit-switch service reference offered for documented operator travel-control arrangements. Manufacturer SL595 parts information identifies this switch separately from its limit nuts, reset switch and complete limit-box assembly. Select it by the exact operator and electrical diagram, not simply by the presence of a mechanical lever. The switch helps the control recognize a travel endpoint when correctly installed and adjusted; it does not replace entrapment protection or correct an operator that overruns because of a different mechanical or wiring fault.

Compatibility — Models, Versions and Exclusions

Match Both Contact Arrangement and Mechanical Actuation

An inconsistent stopping position can originate in the electrical switch, its wiring or the mechanism that actuates it. Have the technician inspect these together rather than replacing a switch based only on the symptom. A loose holder or damaged adjustment component can prevent a sound switch from being operated at the correct point.

Record the original terminal connections and identify how the limit mechanism actuates the switch. Use the exact circuit diagram and manufacturer mounting arrangement. A similar case shape does not establish the correct contact transfer or operating position. After replacement, verify the prescribed travel endpoints and associated controls under the model-specific test procedure. Electrical continuity at one position is not sufficient to demonstrate correct operation of the complete limit system.

Specifications and Product Identification

Before Ordering

• Record the operator model and installed switch markings.
• Match K23-2016 and its exact terminal arrangement.
• Inspect limit actuation, wiring and mechanical travel.
• Plan model-specific adjustment and safety tests after repair.

Package Contents and Separate Requirements

This offer identifies the individual K23-2016 limit switch. A complete limit shaft, collars, mounting bracket, wiring harness, control board and operator are not promised as included. The quantity shown in an operator parts table describes the complete machine and should not be treated as the quantity supplied under this individual service listing. Confirm current carton contents before starting the repair.

Safety Warnings — Read Before Installation or Service

• WARNING: An incorrectly wired or actuated limit switch can permit unsafe door or gate travel. Use qualified operator-service personnel.
• Disconnect all applicable power and secure the moving equipment before touching switches, actuators or wiring.
• Never bypass limits or substitute an unverified contact arrangement. Keep equipment with unreliable stopping out of normal service.
• Complete the prescribed limit and modification tests, including both travel endpoints and all required protection functions, before normal use.

Related Products and Important Differences

• LMRRUL monitored photo eye — a separate protection option only where the exact operator and control revision approve it; not a universal legacy retrofit.
• LMWEKITU monitored wireless edge kit — a separate edge communication system for approved controls and resistive edges; not a replacement for this mechanical or electrical service part.

Frequently Asked Questions

Is this a complete limit box?

No. It is the separately identified switch.

Is it the same as K23-2017?

No interchangeability is established; use the exact service reference.

Can a travel limit replace a safety sensor?

No. Endpoint control and entrapment sensing have separate roles.

Will replacing it eliminate every overrun fault?

No. Wiring, actuation and the rest of the travel system need diagnosis.

Need Help Confirming the Right Product?

Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.