LiftMaster K001D8478 Door Board and Covers — Compatible CAPXL / CAPXM Systems

The LiftMaster K001D8478 is the door-board-and-covers service kit identified for supported CAPXL and CAPXM access-control systems. It is a distinct internal component from the intercom’s main control or carrier board, display and power supply. Match the installed unit’s model, production revision and existing board before ordering. A door that fails to release can involve the lock circuit, wiring, access permissions or power as well as the door board, so this replacement should follow diagnosis of the complete entry-control path.

Compatibility — Models, Versions and Exclusions

Diagnose Entry Control Separately from Display or Network Faults

An intercom can show a normal screen while a door fails to unlock, or an entry problem can originate outside the intercom entirely. Have the technician inspect the intended command, door-board connections, lock supply and field wiring before choosing a board. The repair should address the failed function rather than replacing unrelated electronics because they share the same enclosure.

Record the existing wiring and configuration before service, and preserve the site’s authorization and egress requirements. A replacement board does not create additional user permissions, subscriptions or unsupported entry capacity. After fitting the correct kit, test the controlled entrances individually, including authorized access, denied credentials and the required release and egress behavior.

Specifications and Product Identification

Before Ordering

• Record the full intercom model and manufacturing revision.
• Match K001D8478 to the installed board and applicable parts list.
• Inspect lock power, field wiring and the command path before ordering.
• Confirm the required covers, connectors and commissioning procedure for the current kit.

Package Contents and Separate Requirements

The manufacturer identifies a door board and covers under this reference. Confirm the number and type of supplied covers and any mounting or connection pieces in the current package. A complete intercom, display, main carrier board, power supply, lock, reader and field wiring are not promised as included. A service kit also does not include account enrollment or changes to the property’s access-control subscription.

Safety Warnings — Read Before Installation or Service

• WARNING: Access-control repairs must preserve required emergency egress and safe door or gate operation. Use a qualified access-control installer.
• Disconnect the applicable power sources before opening the unit or moving wiring. Account for separate lock supplies as well as the intercom supply.
• Do not improvise relay wiring or exceed the documented electrical limits of the board and connected equipment. Never defeat required release or safety functions.
• Test each controlled opening and its authorization, release and required safety behavior before restoring normal access.

Related Products and Important Differences

• KPW250 wireless keypad — a different entrance-access method with its own receiver requirements; not a plug-in replacement for this door board.
• LMRRUL monitored photo eye — a separate protection option for approved gate operators; a door-board repair does not replace safety sensing.

Frequently Asked Questions

Is this the main intercom control board?

No. The manufacturer identifies the door board separately from the main or carrier board.

Will it fit every CAP-family product?

No. Verify the exact model and production revision; shared naming does not establish interchangeability.

Does it repair a failed touchscreen?

A touchscreen fault belongs to a different service component and needs its own diagnosis.

Are the covers included in the reference?

Yes, the manufacturer names door board and covers. Confirm the current kit inventory and mounting pieces.

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.