LiftMaster K001A6424 Logic Board, Medium Duty U, 315 MHz
The LiftMaster K001A6424 logic board is the 315 MHz medium-duty U logic control board used in select LiftMaster commercial door operators. It handles the operator control logic and includes the 315 MHz radio receiver function for compatible LiftMaster remote-control accessories.
This is not the same as a residential garage door opener logic board, a Logic 5 industrial board, or a 3-phase power board. It belongs to the medium-duty U-logic commercial operator family. The operator model often includes a U suffix, such as MT-5011-U style references, and the board should match both the operator control platform and the radio frequency used by the site.
The key ordering detail is frequency. K001A6424 is the 315 MHz version. K001A6424-1 is the related 390 MHz version and should not be substituted unless the operator and remote-control system are being handled correctly. If the customer has 315 MHz remotes or an existing 315 MHz board, this listing should stay with the K001A6424 / K1A6424 family.
Where This Part Is Commonly Used
Use K001A6424 when the existing medium-duty U logic board has failed and the parts diagram or board label confirms the 315 MHz version. Symptoms may include no radio response, control logic failure, board damage, or communication issues, but those symptoms can also be caused by power, wiring, control station, or safety-device faults.
The board works with the operator limit system, monitored entrapment protection, control station inputs, and programmed radio controls. After replacement, settings, wiring, remote programming, limits, and safety devices should be checked.
Compatible With
Known and commonly referenced compatibility includes:
- LiftMaster medium-duty U commercial door operators using the 315 MHz logic control board
- MT-5011-U style medium-duty trolley operator references where K001A6424 is listed
- BMT-5011-U style medium-duty belt trolley operator references where K001A6424 is listed
- MJ-5011-U style medium-duty jackshaft operator references where K001A6424 is listed
- MH-5011-U style medium-duty hoist operator references where K001A6424 is listed
- MHS-5011-U style medium-duty slow-speed hoist operator references where K001A6424 is listed
- MGJ-5011-U style medium-duty gearhead/jackshaft references where K001A6424 is listed
- Compatible with LiftMaster 315 MHz remote-control product line where the operator and board support 315 MHz radio programming
- Not the K001A6424-1 390 MHz board and not a Logic 5 commercial board
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Logic control board |
| Part Number | K001A6424 |
| Related Short Number | K1A6424 |
| Application | Medium-duty U commercial door operators |
| Frequency | 315 MHz |
| Control Platform | Medium Duty U Logic |
| Compatible Operator Type | Select MT, BMT, MJ, MH, MHS and MGJ U-logic models |
| Related Part | K001A6424-1 / K1A6424-1 is the 390 MHz version |
| Safety Monitoring | Operator safety-device requirements must be maintained after replacement |
Also Known As / Related Part Numbers
Common related numbers and descriptions include:
- K001A6424
- K1A6424
- 001A6424
- 41A6424
- Logic Board Medium Duty U 315 MHz
- 315 MHz Logic Control Replacement Board
- Medium Duty U logic board
- LiftMaster K0016424 - common shortened listing text
Technician Note
If replacing this board to solve radio issues, confirm the site is actually using 315 MHz remotes and that the antenna, programming, and accessory wiring are correct. A 390 MHz board or older remote family will not solve a 315 MHz compatibility problem.
Before Ordering
- Confirm the operator is a medium-duty U-logic model.
- Confirm the failed board label or manual calls for K001A6424 / K1A6424.
- Confirm the radio frequency is 315 MHz, not 390 MHz.
- Record control wiring and programmed accessory setup before removal.
- Inspect safety-device wiring and do not return the operator to service until monitored entrapment protection and controls test properly.
Professional Advisory
This board interfaces with commercial operator controls and safety circuits. Disconnect power, follow the installation instructions, and have a qualified commercial door technician complete wiring, programming, limit verification, and safety testing. Do not bypass monitored safety devices to make the operator run.
Product Questions and Answers
Is K001A6424 a 315 MHz or 390 MHz board?
K001A6424 is the 315 MHz medium-duty U logic board. K001A6424-1 is the related 390 MHz version.
Which LiftMaster operators commonly use this board?
It is commonly associated with medium-duty U commercial operator families such as MT, BMT, MJ, MH, MHS, and MGJ where the parts diagram lists K001A6424.
Can this board replace a residential opener logic board?
No. This is a commercial medium-duty U logic board, not a residential garage door opener board.
Will my remotes need to be reprogrammed?
In most board replacements, compatible remotes and accessories should be checked and may need to be programmed to the replacement board.
What safety devices should be checked after board replacement?
Monitored entrapment protection, photo eyes or edges where required, wall controls, limit settings, and stop/open/close commands should all be tested before returning the operator to service.
