Liftmaster G292 Resistor, 25W, 10%, 2OHM - 29-2, Commercial Door Operator
The LiftMaster K29-2 is a service replacement resistor used in select commercial door operator assemblies. It is rated 25 watts, 10 percent tolerance, and 2 ohms, which means it is intended for a very specific electrical load inside the operator circuit. When the original resistor is heat damaged, open, cracked, or visibly burned, this part may be needed to restore the circuit to the condition shown in the operator parts diagram.
This is a small part, but correct matching matters. Commercial door operators may use similar-looking resistors with different values, and the wrong resistance or wattage can create nuisance failures, overheating, or control-board damage. For that reason, the safest way to order this part is by matching the original K29-2, 29-2, or G292 reference from the service diagram rather than measuring the body size alone.
If the resistor failed because of a shorted component, damaged wiring, incorrect voltage, or a stuck relay/contactor, a new resistor may fail again. The operator should be inspected before returning the door to service.
Compatible With
Commonly associated with various LiftMaster commercial door operators where the original parts diagram calls for K29-2, 29-2, or G292. Compatibility should be verified by operator model, wiring diagram, and original resistor rating before ordering.
Features & Specifications
| Manufacturer | LiftMaster |
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| Product Type | Commercial door operator resistor |
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| Part Number | K29-2 |
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| Related Number | G292, 29-2 |
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| Electrical Rating | 25W, 10 percent, 2 ohm |
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| Application | Select LiftMaster commercial door operator electrical assemblies |
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| Notes | Match by parts diagram and resistor rating |
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Also Known As / Related Part Numbers
- K29-2
- 29-2
- G292
- LiftMaster 29-2 resistor
Technician Note
Do not replace this part with a resistor that only looks similar. Match the ohm value, wattage, tolerance, and original LiftMaster part reference.
Before Ordering
- Match the part number K29-2, 29-2, or G292 from the operator manual.
- Confirm the resistor rating is 25W, 10 percent, 2 ohm.
- Inspect for burned wiring, damaged terminals, or failed electrical components.
- Disconnect power before service.
- Use a qualified commercial door technician for electrical troubleshooting.
Important Ordering Warnings
- Not interchangeable with other resistor values.
- A repeated resistor failure usually points to another electrical problem.
Professional Advisory
Commercial door operator electrical repairs can involve high voltage and moving equipment. Do not bypass safety devices or operate the door until the electrical issue has been corrected and the door has been tested safely.
Product Questions & Answers
What does the K29-2 resistor do in a commercial door operator?
The K29-2 is a 25 watt, 2 ohm resistor used in select LiftMaster commercial door operator circuits. It must match the original resistor rating and parts diagram for the operator.
Can I replace this resistor with a different ohm or watt rating?
No. The resistance, wattage, and tolerance should match the original part. A different rating can cause improper operation or damage to the control circuit.
Is K29-2 used on every LiftMaster commercial door operator?
No. It is listed for various LiftMaster commercial door operators, but compatibility is model and diagram dependent.
What should I check before replacing the resistor?
Check for heat damage, failed wiring, loose terminals, or a control issue that may have caused the resistor to fail. Replacing the resistor alone may not correct the root problem.
Should a technician install this part?
Yes, especially on commercial operators. Power should be disconnected and the operator should be serviced by a qualified door technician when electrical components are being replaced.
