LiftMaster K1D8402-1CC Single-Phase Power Board — SL3000 and CSW200 Applications

The LiftMaster K1D8402-1CC is a single-phase gate-operator power-board service reference. Select it from the exact operator parts list and any applicable manufacturer correction before ordering. It is separate from the main logic board, transformer and motor. Similar-looking boards and a shared single-phase designation do not establish interchangeable fit. Have the technician diagnose the power and motor-control circuit and confirm the original board label so the replacement matches the actual equipment generation.

Compatibility — Models, Versions and Exclusions

Match the Correct Power Board to the Operator

LiftMaster’s support page for the 2018 SL3000UL manual explicitly corrects the motor-drive/power-board part number to K1D8402-1CC. The referenced CSW200501U repair drawing also identifies this part. Verify the exact operator and original board before purchase, particularly where an older printed manual shows a different number. A manufacturer correction is specific evidence, not a blanket interchangeability rule for other operators.

A gate that does not respond may have a supply, switch, fuse, wiring, motor or mechanical fault. Replacing a power board without checking those conditions can leave the original fault unresolved. Record diagnostic information and inspect the connected components before ordering. Preserve photographs of the wiring so the technician can restore the manufacturer’s arrangement during service.

Specifications and Product Identification

Before Ordering

• Read the complete operator model and existing board number.
• Verify the correct service reference and any manufacturer correction.
• Have supply, motor circuit and connected wiring checked.
• Identify required setup and safety testing after the board is replaced.

Package Contents and Separate Requirements

This listing identifies the power-board service item. A main logic board, transformer, motor, capacitor, enclosure or complete harness is not promised as included. Confirm the current carton and supplied revision. Parts grouped within an electrical-box drawing can be separate items; the drawing is not proof that the complete electrical assembly ships under this board number.

Safety Warnings — Read Before Installation or Service

• WARNING: AC gate electronics contain hazardous voltage and can cause unexpected movement. Replacement requires a qualified gate-systems technician.
• Disconnect and secure every applicable power source before touching wiring or removing the board.
• Do not fit a three-phase board or another model’s board based only on connector appearance. Never bypass protection to make an unmatched part run.
• Restore the specified wiring, covers and settings, then test travel, reversal and all required safety devices 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 monitored-edge communication system with its own compatibility requirements; it does not replace this service part.

Frequently Asked Questions

Why does my older drawing show K1D8284-1CC?

LiftMaster publishes a correction for the specified SL3000UL manual. Have the exact operator and board checked against that correction before ordering.

Is this the main logic board?

No. The documented assemblies list the main control board separately. Diagnose which electronic component the repair requires.

Will this fix every no-movement fault?

No. The supply, control signals, motor, wiring and mechanical drive require diagnosis.

Is the entire electrical enclosure included?

No complete enclosure is promised. Confirm the actual board kit contents and any separately required parts.

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.