Product Overview
The LiftMaster K001A6424 is a replacement 315 MHz logic control board for select LiftMaster Medium Duty Logic commercial door operators. This board is part of the operator control system and manages operator commands, accessory inputs, safety monitoring, and onboard receiver functions depending on the operator setup. It is most often searched for as the medium-duty U logic board and is commonly tied to UL325-compliant medium-duty commercial operators.
Logic boards must be matched more carefully than many mechanical parts. The operator model family, logic generation, radio frequency, monitored safety requirements, wiring harness, and board connectors all matter. A board from a similar-looking commercial operator may not function correctly if the operator generation or logic platform is different. After installation, the operator may require limit setup, control programming, remote programming, and safety-device verification before normal use.
Compatible With
- Select LiftMaster Medium Duty Logic U commercial door operators
- LiftMaster MJ medium-duty operators when the parts diagram specifies K001A6424/K1A6424
- LiftMaster MH medium-duty operators when the parts diagram specifies K001A6424/K1A6424
- LiftMaster MHS medium-duty operators when the parts diagram specifies K001A6424/K1A6424
- LiftMaster MT medium-duty operators, including U-style model identifiers such as MT-5011-U when applicable
- LiftMaster BMT medium-duty operators when confirmed by parts diagram
- LiftMaster MGJ medium-duty operators when confirmed by parts diagram
- Not a universal Logic 3, Logic 4, MAXUM, or residential garage opener board
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Logic control board |
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| Part Number | K001A6424 |
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| Application | Medium-duty commercial door operator control board replacement |
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| Compatible Operator Type | Select LiftMaster medium-duty U commercial door operators |
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| Frequency | 315 MHz |
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| Security Technology | Verify remote and receiver compatibility by operator generation |
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| Safety Monitoring | Verify UL325/monitored safety requirements for the operator |
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| Notes | Match board number, connectors, and operator model before ordering |
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Also Known As / Related Part Numbers
- K001A6424
- K1A6424
- K001A6424-2 related search reference
- K1A6424-1 related search reference
- 315 MHz medium duty logic board
- Medium Duty Logic U board
Technician Note
Before replacing the logic board, verify incoming power, transformer output, stop circuit, monitored entrapment devices, wall control wiring, and accessory wiring. A failed accessory or shorted control wire can make a good board appear defective.
Before Ordering
- Confirm K001A6424 or K1A6424 appears on the original board or operator parts list.
- Verify the operator is a compatible medium-duty U commercial door operator.
- Check the radio frequency and remote compatibility requirements.
- Compare connector layout and terminal labeling before installation.
- Plan to test limits, safety devices, controls, and remotes after replacement.
Important Ordering Warnings
- Do not install this board as a general replacement for unrelated Logic 3, Logic 4, or residential boards.
- Never bypass monitored safety devices to make a replacement board run.
Professional Advisory
Commercial door controls should be serviced with power disconnected and with the door secured. If the operator has missing monitored safety devices, unsafe travel, or wiring damage, have a qualified commercial door technician correct the issue before returning the system to normal operation.
Product Questions and Answers
What frequency is the K001A6424 logic board?
K001A6424 is commonly listed as a 315 MHz logic control board.
Which operator families can use this board?
It is associated with select LiftMaster medium-duty commercial operator families including MJ, MH, MHS, MT, BMT, and MGJ when the parts diagram calls for K001A6424 or K1A6424.
Is this a universal commercial door board?
No. It must match the operator generation, board number, connectors, and control platform.
Will remotes need to be programmed after replacement?
Usually yes. Remote controls, limits, and some operator settings may need to be programmed or verified after a logic board replacement.
What should be checked before blaming the board?
Check power, transformer output, stop circuit, monitored safety devices, wall controls, and accessory wiring before replacing the board.
