Liftmaster K79-13493SJ Logic Board Kit
The LiftMaster K79-13493SJ logic board kit is a commercial operator control board replacement for select SJ series sliding jackshaft door operators. In these systems, the logic board manages control station commands, accessory inputs, monitored safety circuits, and operator logic. A failed or incorrect board can cause no-run conditions, input errors, intermittent operation, or control behavior that does not match the operator setup.
This batch item is written specifically around the SJ version of the K79-13493 board family. Search results and parts breakdown references tie K79-13493SJ to LiftMaster SJ commercial operator applications, including SJ1011, SJ1021, SJ1023, SJ1043, and SJ1053 style references. Other K79-13493 boards can look related in search results, but FDOA, FDCL, chip-version, and battery charge control references should be checked separately before substitution.
What This Part Does
- Replaces the main logic/control board in select SJ commercial door operators.
- Processes operator commands from wall controls, interlocks, monitored devices, and accessory inputs.
- Helps restore proper operator logic when the original board has failed and the part number matches.
Compatible With
Known compatibility and application references found during this review include:
- LiftMaster SJ commercial door operators where the replacement parts diagram calls for K79-13493SJ.
- SJ1011, SJ1021, SJ1023, and SJ1043 starter parts references tied to the SJ model family.
- SJ1053 wall-mounted commercial operator references where K79-13493SJ appears as a logic board assembly.
- Commercial door operator applications only when the original board label and parts diagram match the SJ board family.
Also Known As / Related Part Numbers
Use these references carefully because the K79-13493 family has several similar boards:
Features & Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Commercial operator logic board kit |
| Part Number | K79-13493SJ |
| Application | Select SJ commercial door operators |
| Compatible Operator Type | SJ sliding jackshaft / commercial door operator applications |
| Common Model References | SJ1011, SJ1021, SJ1023, SJ1043, SJ1053 where supported by diagram |
| Board Family | K79-13493 commercial control board family |
| Safety Monitoring | Must retain required monitored safety device and interlock wiring |
| Notes | Do not substitute FDCL, FDOA, chip-version, or battery charge boards without checking the exact diagram. |
Technician Note
Before replacing the board, confirm incoming power, control station wiring, stop circuit continuity, monitored entrapment protection, and accessory wiring. Many commercial operator faults look like a bad board but are caused by an open stop circuit, failed safety device, loose terminal, or damaged wiring.
Before Ordering
- Match the original board label to K79-13493SJ.
- Confirm the operator is an SJ model and not an FDO, FDCL, GH, H, J, or MH unit.
- Compare all plug positions and terminal markings before removing the old board.
- Document dip switch, selector, and accessory wiring positions before replacement.
- Use a qualified technician for commercial operator control board replacement and testing.
Professional Advisory
After any commercial operator control board replacement, the door must be tested for correct open, close, stop, limit, monitored safety, and manual disconnect operation. Do not bypass required safety devices to make the operator run.
Product Questions
What operator family does K79-13493SJ fit?
It is tied to select LiftMaster SJ commercial door operators. References found during review include SJ1011, SJ1021, SJ1023, SJ1043, and SJ1053 style applications where the parts diagram calls for the SJ board.
Are all K79-13493 boards interchangeable?
No. The K79-13493 family includes SJ, FDOA, FDCL, chip-version, and battery charge related boards. The suffix and operator family must match.
Can a bad safety device make the logic board look failed?
Yes. Open stop circuits, failed monitored safety devices, or shorted accessory wiring can stop a commercial operator from running even when the board is not the root cause.
Should settings be copied from the old board?
Yes. Document the original wiring and settings before removal. Some commercial operators require setup checks after board replacement.
Does this board replace a battery charge control board?
No. K79-40370 and other charge circuit references are separate related items. K79-13493SJ should be matched only where the logic board diagram calls for it.
