LiftMaster K001A6424 Medium-Duty Logic Board – 315 MHz Receiver – MJ, MH, MHS, MT, BMT & MGJ

The LiftMaster K001A6424 Medium-Duty Logic Board is a genuine replacement control board with an integrated 315 MHz radio receiver for compatible LiftMaster commercial door operators.

The board serves as the primary electronic controller for the operator, managing door commands, accessory inputs, safety-device monitoring, timer functions, and compatible remote-control communication.

Specifications

• Brand: LiftMaster

• Part Number: K001A6424

• Product Type: Commercial Operator Logic Board

• Control Platform: Medium-Duty Logic U

• Radio Frequency: 315 MHz

• Receiver: Integrated

• Application: Commercial overhead door operators

• Operator Generation: Select UL325-compliant medium-duty operators

• Quantity: 1 Logic Board

Compatible LiftMaster Operator Series

The K001A6424 is used with select LiftMaster Medium-Duty Logic commercial operators including:

• MJ Series

• MH Series

• MHS Series

• MT Series

• BMT Series

• MGJ Series

Compatibility depends on operator generation and control configuration. Always verify the existing board number or operator parts diagram before ordering.

Integrated 315 MHz Receiver

The K001A6424 includes an integrated 315 MHz radio receiver for compatible LiftMaster remote controls.

The receiver can support compatible Security+ transmitters and appropriate LiftMaster radio accessories depending on the operator configuration.

Remote controls may need to be programmed again after replacing the logic board.

Important 315 MHz vs. 390 MHz Difference

This listing is for:

K001A6424 – Medium-Duty Logic U – 315 MHz

Do not confuse it with:

K001A6424-1 – Medium-Duty Logic U – 390 MHz

Although the boards are closely related, their integrated radio frequencies are different.

Confirm the exact existing board number and radio frequency before ordering.

Not a Universal LiftMaster Logic Board

The K001A6424 should not be used as a general replacement for unrelated LiftMaster commercial operator control boards.

It is not automatically interchangeable with:

• Logic 4 boards

• Logic 5 boards

• MAXUM operator boards

• Residential garage door opener boards

• 390 MHz K001A6424-1 boards

• Earlier non-UL325 Medium-Duty Logic boards

Always match the replacement board to the operator model, production generation, and original board number.

When a Logic Board May Need Replacement

Possible symptoms of a failed or damaged logic board may include:

• Operator does not respond to control commands

• Intermittent operator operation

• Remote controls no longer function properly

• Accessory inputs fail to operate

• Timer or control functions behave incorrectly

• Visible electrical damage to the existing board

• Failed control circuitry confirmed during troubleshooting

These symptoms may also be caused by wiring, power supply, safety devices, wall controls, limits, or other operator components. Proper diagnosis is recommended before replacing the logic board.

Installation & Safety

Disconnect electrical power before servicing the commercial operator.

After replacing the board, verify and test:

• Open / Close / Stop controls

• Travel limits

• Remote controls

• Photoelectric sensors

• Sensing edges

• Monitored entrapment-protection devices

• Timer-to-close functions

• Accessory inputs

• Emergency disconnect systems

All safety devices must operate correctly before the commercial door is returned to service.

Commercial overhead door operators contain high-voltage electrical equipment and powerful moving components. Installation and troubleshooting should be performed by a qualified commercial door technician.

If you are unsure whether the LiftMaster K001A6424 is correct for your operator, contact Garage-DoorParts.com with the operator model number, serial information, and photos of the existing logic board before ordering.