LiftMaster K002B0799-4 Lock and Key Set for EL1SS Telephone Entry System
The K002B0799-4 lock and key set is the cabinet security hardware for the LiftMaster EL1SS telephone entry system. On an EL1SS installation, the enclosure protects the internal telephone entry electronics, wiring, call button assembly, keypad, transformer connections, and relay wiring. When the lock no longer works, the cabinet may be left unsecured or may need to be forced open during service, which can damage the enclosure. This replacement kit is intended to restore normal physical access and closure. It does not repair call routing, keypad programming, relay output, transformer power, or audio issues. Those symptoms should be diagnosed separately using the EL1SS manual and proper service procedures.
Compatible With
- LiftMaster EL1SS telephone entry system
- LiftMaster EL1SS intercom/telephone entry cabinet applications using K002B0799-4
- Select LiftMaster telephone entry system parts diagrams that call for K002B0799-4
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Lock and key set |
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| Part Number | K002B0799-4 |
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| Application | Telephone entry system cabinet lock replacement |
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| Compatible Product Type | EL1SS telephone entry system |
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| Primary Model Reference | EL1SS |
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| Related Numbers | 002B0799-4 |
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| Notes | Different from K002B0799-3 CAPXL/CAPXLV cam and lock kit |
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Also Known As / Related Part Numbers
- K002B0799-4
- 002B0799-4
- K002B07994
- LiftMaster EL1SS lock and key set
- EL1SS lock kit
- EL1SS cabinet key and lock set
Technician Note
If the EL1SS is not calling, not powering up, or not activating the relay, the lock kit is not the electrical repair. Use this kit only for the cabinet lock/key function.
Before Ordering Checklist
- Confirm the telephone entry system model is EL1SS.
- Check that the enclosure and latch point are not bent or damaged.
- Do not confuse this item with CAPXL/CAPXLV lock kit K002B0799-3.
- Confirm whether the problem is keys, lock cylinder, or another internal component.
- Retain spare keys with site maintenance records.
Professional Advisory
Telephone entry cabinets contain wiring and control components. If the system has power, call, relay, or programming problems, use a qualified technician rather than forcing access or bypassing circuits.
Important Ordering Warnings
- Not for CAPXL or CAPXLV access systems.
- Does not include call button, transformer, keypad, or circuit board repairs.
- Older cabinets may have been rekeyed in the field, so verify the existing lock if possible.
Product Questions and Answers
Which telephone entry system uses K002B0799-4?
K002B0799-4 is commonly listed as the lock and key kit for the LiftMaster EL1SS telephone entry system.
No. K002B0799-3 is commonly associated with CAPXL and CAPXLV systems, while K002B0799-4 is listed for EL1SS. Do not interchange them without confirmation.
Does this kit repair EL1SS calling or keypad problems?
No. It only replaces the physical lock and key set. Call button, transformer, phone-line, keypad, or circuit problems require separate diagnosis.
When should this kit be replaced?
Replace it when the EL1SS lock is missing, broken, corroded, keyed incorrectly, or no longer secures the cabinet door properly.
What should be checked before ordering?
Confirm the unit model is EL1SS, inspect the existing lock area, and review the parts diagram to make sure the lock and key set is the correct service item.
