LiftMaster K1A6426-2 / K001A6426-2 Control Board — Legacy RSL12V / RSW12V

The LiftMaster K1A6426-2 supplier reference identifies manufacturer control board K001A6426-2 for documented legacy RSL12V and RSW12V gate operators. This is a model-specific replacement for the original 12V platform, not a universal board for every LiftMaster gate with a 12V battery. Match the full operator model, installed board number and wiring diagram before ordering. Keep the radio receiver and its frequency identification separate from the main-board selection, because a compatible control board alone does not establish compatibility with every existing remote.

Compatibility — Models, Versions and Exclusions

Preserve the Existing System Identification Before Replacing Controls

An unresponsive operator does not necessarily have a failed main board. Battery condition, charging supply, damaged wiring, an active protection input or a mechanical fault can produce similar symptoms. Have a qualified technician diagnose the complete system before ordering electronics, and record the original settings and connected accessories while the installation can still be identified.

The legacy documentation identifies radio modules separately from the main controller. K001A6636 and K001A6636-1 are distinct radio references, so retain the full module label rather than recording only the brand of the remote. Do not assume that replacing this board upgrades the radio protocol, adds newer monitored inputs or converts an older operator into a current model. Any required modernization needs its own documented equipment selection.

Specifications and Product Identification

Before Ordering

• Photograph the operator nameplate, board number and connected wiring.
• Check the battery, charging path and diagnostic indications before condemning the board.
• Identify the separate radio module and all connected access and protection devices.
• Confirm the current replacement revision and manufacturer commissioning requirements.

Package Contents and Separate Requirements

This offer identifies the main control board. A radio module, remotes, battery, charger, motor, wiring harness or complete control enclosure is not promised as included. Confirm the current carton and any required installation components before purchase. Parts shown together in an operator diagram are not necessarily supplied together, and existing accessories may need separate evaluation before they can be returned to service.

Safety Warnings — Read Before Installation or Service

• WARNING: A control-board repair can change gate movement and protection behavior. Use a qualified gate-systems technician and secure the gate before service.
• Disconnect all applicable sources, including the battery and any AC or solar charging supply, according to the model-specific procedure.
• Do not bypass a protection input to make the replacement operate. Preserve the documented wiring and use only approved accessories for the actual controller.
• Recheck travel, reversal, access commands and every required protection device before allowing normal traffic through the entrance.

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

Are K1A6426-2 and K001A6426-2 different listing identities?

The supplier uses the shortened K1A6426-2 reference for manufacturer K001A6426-2. Confirm the actual supplied label.

Will it fit every RSL or RSW operator?

No. Full suffixes and electronics generations matter; use the exact service reference.

Does a replacement board include the radio module?

A separate radio module is not promised as included. Verify the current package.

Will it make older equipment equivalent to a new UL model?

No. A board replacement does not establish a complete modern-operator conversion or universal accessory support.

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.