Liftmaster K001D8478 Door Control Board for CAPXL and CAPXM Access Control Entry Systems
The LiftMaster K001D8478 door control board supports the physical entry-control functions inside compatible CAPXL, CAPXLV, and CAPXM smart video intercom systems. This board helps route and manage the interface between the intercom electronics and the entry hardware connected to the unit, such as gate relay outputs, door release wiring, Wiegand readers, request-to-exit devices, and status or monitored input wiring when configured by the installation. In the field, this part may be considered when an intercom powers up and communicates but has trouble releasing an entry point, reading connected devices, or responding to wired input/output signals. Correct diagnosis matters because similar symptoms can be caused by power problems, lock power supplies, relay wiring, incorrect programming, damaged field wiring, or a failed main control assembly. Match K001D8478 by model and board layout before installing.
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Door control board / door board and covers kit |
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| Part Number | K001D8478 |
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| Application | Smart video intercom access-control I/O service |
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| Compatible System Type | Select CAPXL, CAPXLV, and CAPXM connected access systems |
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| Related Functions | Door/gate relay control, reader/input/output interface, access point wiring |
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| Notes | Board-level service part; verify by parts diagram |
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Compatible With
- LiftMaster CAPXL High Capacity Connected Access systems where K001D8478 is listed
- LiftMaster CAPXLV Smart Video Intercom Large Series systems where K001D8478 is listed
- LiftMaster CAPXM Smart Video Intercom Medium Series systems where K001D8478 is listed
- Select myQ Community access-control intercom installations using the matching door board assembly
Also Known As / Related Part Numbers
- K001D8478
- 001D8478
- 1D8478
- CAPXL door board
- CAPXM door board
- CAPXL door board and covers kit
- CAPXM door board and covers kit
Technician Note
If the intercom display, camera, or network connection works but the door or gate output does not respond, confirm wiring, relay programming, lock power, and field devices before condemning the board.
Before Ordering
- Confirm the exact intercom model and board number.
- Compare connector positions and mounting points to the original board.
- Document all relay, reader, REX, status, and lock wiring before removal.
- Inspect for surge damage, water intrusion, corrosion, and loose terminal connections.
- Test all controlled doors/gates after replacement.
Professional Advisory
This board may interface with electric strikes, maglocks, and gate operators. Use proper power supplies and do not power external lock devices from reader power terminals unless the manual specifically allows it.
Important Ordering Warnings
- Do not bypass supervised inputs or safety-related wiring to make an entry point operate.
- Do not assume a failed lock, maglock, or gate relay is a board problem without testing the field wiring.
- Do not interchange CAPXL/CAPXM boards by appearance only.
Product Questions and Answers
What does the K001D8478 board control?
It is used for the door/gate access-control input and output side of supported LiftMaster CAPXL, CAPXLV, and CAPXM systems.
Will this fix a blank display?
Not necessarily. A blank display may involve power, front panel, display, main board, or wiring issues rather than the door control board.
Can this board control more than one entry point?
CAPXL and CAPXM systems can be configured for multiple access points depending on model and wiring. Confirm the system layout before replacement.
Is this the same as a gate operator control board?
No. It is an access-control intercom board, not the main control board inside a gate operator.
Should wiring be labeled before removing the board?
Yes. Label and photograph all terminals and harnesses before removing the original board to avoid entry-control wiring mistakes.
