Liftmaster K94-37449, RESET BUTTON, WITH ID RESISTOR
The LiftMaster K94-37449 is a factory-style reset button assembly supplied with an ID resistor for specific LiftMaster commercial gate operator control systems. On modern UL-compliant gate operators, the reset circuit is not just a simple push button; the control board may use an identification resistor or matching harness arrangement to recognize the correct reset input and maintain the proper fault-reset behavior.
This part is most commonly researched for CSW200 commercial swing gate operator service. It is used when the external or internal reset button becomes damaged, the button cap no longer actuates cleanly, the wiring has been compromised, or the operator will not clear a fault after proper troubleshooting. Correct fitment matters because other LiftMaster reset buttons may look similar but use different resistor values, connector layouts, harness lengths, or operator identification.
Compatible With
- LiftMaster CSW200 commercial swing gate operators, when the parts diagram calls for K94-37449
- LiftMaster CSW200U / CSW200UL style references where the matching reset button with ID resistor is shown by diagram
- Select LiftMaster commercial gate operators that specifically list K94-37449 as the reset button with ID resistor
- Not a confirmed replacement for SL3000U, SL585U, HCTDCU, LA400, CSL24, RSW12, or heavy-duty HD operators unless the diagram lists this exact part
Features and Specifications
| Manufacturer | LiftMaster |
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| Product Type | Reset button with ID resistor |
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| Part Number | K94-37449 |
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| Application | Manual reset / operator identification circuit service |
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| Compatible Operator Type | Select commercial swing gate operators |
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| Commonly Associated Models | CSW200, CSW200U, CSW200UL style references when confirmed by diagram |
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| Notes | Match by part number, connector, resistor ID, and operator wiring diagram |
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Also Known As / Related Part Numbers
Technician Note
If the operator still shows a fault after the reset button is replaced, do not assume the switch was the only issue. Check the diagnostic display, entrapment inputs, stop circuit, and monitored safety devices before returning the gate to service.
Before Ordering
- Verify the installed operator model and serial range.
- Compare the existing reset button assembly to K94-37449.
- Confirm the control board requires an ID resistor style reset input.
- Check the connector and harness routing before removing the old assembly.
- Do not bypass the reset, stop, or entrapment protection circuits.
Professional Advisory
Gate operator electrical service should be performed by a qualified technician. Disconnect power before accessing the control box and follow the LiftMaster wiring diagram for the installed operator.
Important Ordering Warnings
- Do not use this part as a generic push button.
- Do not substitute another reset switch just because the button face looks similar.
- Wrong ID resistor or wiring can prevent proper reset operation.
- Manual reset should only be used after the underlying fault condition has been corrected.
Product Questions and Answers
What does the ID resistor do on this reset button?
The ID resistor helps the compatible LiftMaster control system recognize the correct reset circuit. It is one reason this part should be matched by part number and diagram instead of replaced with a generic button.
Is K94-37449 confirmed for CSW200 operators?
Yes, the strongest references tie K94-37449 to CSW200 commercial swing gate operator applications, including CSW200 style configurations when shown by the parts diagram.
No. Those are related reset switch part numbers for different operator families. They should not be treated as interchangeable unless LiftMaster documentation for the exact operator says so.
Why would this reset button need replacement?
Common reasons include a damaged button, broken wiring, failed contact action, corrosion, or a reset circuit that no longer responds during normal fault-clearing procedures.
Can the gate be operated with the reset circuit bypassed?
No. The reset and safety circuits should not be bypassed. A qualified gate technician should correct the fault and verify all required safety devices before the operator is returned to service.
