LiftMaster K41-0072-000 Relay Adapter Board, HD
The LiftMaster K41-0072-000 relay adapter board is a service board used on select HD gate operators where relay output or interface functions are required. It is not the main logic board, power board, or motor drive board.
This board may be reviewed when relay-controlled accessories, signaling outputs, or related interface functions stop working, or when the board is visibly damaged. Since relay adapter wiring can be tied into outside equipment, troubleshooting should include the connected device, the wiring, and the operator output settings.
Most references list HDSL24UL and HDSW24UL. Some sources mention IHSL24UL and INSL24UL as compatible with K41-0072-000, while other references focus only on the HD swing and slide platforms. Use the operator parts diagram and the original board label for final confirmation.
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Relay Adapter Board Service Kit |
| Part Number | K41-0072-000 |
| Application | Relay interface board for HD gate operator control/accessory circuits |
| Compatible Operator Type | Heavy-duty commercial swing and slide gate operators |
| Service Area | Relay interface / accessory output board |
| Operator Series | HD swing, HD slide, and select industrial HD platforms to verify |
| Related Harness | K94-34778 appears in some relay adapter board references |
| Notes | Match by exact part number and operator parts diagram before ordering. |
Compatible With
Common Compatible Models
- HDSL24UL heavy-duty slide gate operator
- HDSW24UL heavy-duty swing gate operator
- HDSL24ULMC / HDSW24ULMC when the parts diagram confirms the same board
Additional Model Families to Verify
- IHSL24UL and INSL24UL where current parts references call for K41-0072-000
- HD gate operators using the matching relay adapter board and harness layout
Important Compatibility Notes
- Do not confuse with K41-0071-000 HD power board, K41-0078-000 EMI board, or motor drive boards.
- Some references list wire harness K94-34778 as associated with this relay board.
- Confirm connector layout and board marking before ordering.
Also Known As / Related Part Numbers
- K41-0072-000
- 41-0072-000
- K410072000
- K41 0072 000
- HD relay adapter board
- HD gate relay adaptor board
- K94-34778 related harness to verify
Technician Note
Before replacing this board, check the connected relay load or accessory. A shorted device, damaged cable, or incorrect external wiring can damage a relay adapter board again after replacement.
Before Ordering Checklist
- Confirm the existing board is K41-0072-000, not the main control board or power board.
- Verify operator model and parts diagram.
- Compare connector locations and harness style.
- Inspect external relay wiring and connected accessories for shorts or damage.
- Use a qualified technician for board-level gate operator wiring.
Professional Advisory
Relay adapter board work may involve accessory wiring and powered circuits. Disconnect power and verify wiring before replacing the board.
Important Ordering Warnings
- Not a main control board.
- Not a power board or EMI board.
- External wiring faults can damage the replacement board.
Product Questions and Answers
What is K41-0072-000 used for?
It is a relay adapter board service kit used for supported relay/interface functions on compatible LiftMaster HD gate operators.
Which models commonly use this relay adapter board?
Common references include HDSL24UL and HDSW24UL. Some sources also mention IHSL24UL and INSL24UL where confirmed by parts diagram.
Is this the same as the main control board?
No. K41-0072-000 is a relay adapter board, not the main control board, power board, EMI board, or motor drive board.
What should be checked before replacing the board?
Check the original board label, connector layout, operator parts diagram, external relay wiring, and connected accessories.
Can a bad accessory damage this board?
Yes. A shorted accessory, wrong wiring, or damaged cable can damage a relay adapter board and should be corrected before installing the replacement.
