LiftMaster Q029 / K23-50099 Gate Operator Limit Switch
LiftMaster Q029 / K23-50099 Gate Operator Limit Switch
The LiftMaster Q029 is an electrical limit switch identified by the supplier as manufacturer part K23-50099. It is used in documented gate-operator limit arrangements, including the CSW200U repair-parts listing. Choose it when the diagnosed repair calls for this exact switch, and verify the mounting and connection against the applicable manual. It is not the Q238 adjustment cam, a complete limit assembly or a universal switch for every LiftMaster operator. The full service reference is essential when matching older Elite-branded equipment.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| CSW200U | The referenced manufacturer repair-parts drawing identifies K23-50099 as the limit switch. |
| Miracle-One | The manufacturer parts list identifies Q029; verify the actual limit arrangement and required quantity. |
| Q238 / K75-50339 | A separate adjustment component, not this electrical switch. |
| Complete limit assemblies and APS encoders | Different service items; no interchangeability established by a shared travel-control purpose. |
Confirm Whether the Switch or Its Actuating Mechanism Has Failed
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.
The replacement must mount and connect as prescribed for the operator. Do not select a generic microswitch solely because it looks similar, and do not assume unverified contact ratings or terminal arrangements. Record the original part reference and take a clear photograph before disconnecting wiring. This helps distinguish a single-switch repair from a job requiring the complete limit assembly.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Supplier SKU | Q029 |
| Manufacturer reference | K23-50099 |
| Component | Electrical travel-limit switch |
| Documented example | CSW200U manufacturer repair-parts list |
| Additional legacy reference | Miracle-One manual lists Q029 as one limit switch |
| Selection basis | Exact operator diagram, mounting and electrical connections |
Before Ordering
- Identify the full operator model and applicable service drawing.
- Match Q029 / K23-50099 to the installed switch.
- Inspect the holder, adjustment parts, actuating mechanism and wiring.
- Confirm the number of switches and any separate mounting components needed for the repair.
Package Contents and Separate Requirements
This listing identifies the individual limit switch. A complete holder, adjustment cam, wiring harness or multi-switch assembly is not promised as included. Confirm the current carton before ordering. In a parts diagram, a switch can appear inside a larger service kit, but that does not make the entire illustrated assembly part of an individual Q029 purchase.
Safety Warnings — Read Before Installation or Service
- WARNING: A faulty or incorrectly installed limit switch can allow dangerous travel beyond the intended stopping point. Use a qualified gate-systems technician.
- Isolate all applicable power sources and secure the gate before touching the switch or wiring.
- Never bridge a limit switch to restore normal operation. Keep the gate out of service until unreliable stopping is corrected.
- After service, perform the prescribed limit setup and verify both endpoints, reversal and all required protection devices.
Related Products and Important Differences
- LMRRUL monitored photo eye — a separate safety accessory only where the installed control system approves it; not a replacement limit switch.
- LMWEKITU monitored wireless edge kit — a separate protection-system component with its own compatibility requirements; it does not establish travel endpoints.
Frequently Asked Questions
Is Q029 sold as a complete limit system?
No. The manufacturer identifies Q029 as an individual limit switch. Confirm any additional holder, cam or harness needed.
Is Q238 interchangeable with this switch?
No. Q238 is the separate K75-50339 adjustment component. The two have different roles in the limit arrangement.
Will this fit every Elite gate operator?
No blanket fit is established. Use the exact model and generation’s parts documentation.
Can a new switch fix loose limit hardware?
Not by itself. The technician must correct mounting or actuating faults and verify the complete limit system after repair.
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.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
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