LiftMaster 333LM 3-Button Open Close Stop Remote Control 315 MHz
The LiftMaster 333LM is an older 315 MHz three-button remote used in commercial door applications where the operator or external receiver is configured for open, close, and stop commands. Each button is typically assigned to a different control function, making the remote useful for commercial sectional doors, rolling doors, shared access doors, and three-channel receiver installations. It is not the same kind of accessory as a standard one-button residential garage remote. The important fitment point is the receiver and command setup: the system must support the 315 MHz radio format and the three-button command arrangement. This part is often cross-searched with 333LMC and the newer 813LMX replacement path, but older receivers and wiring configurations can vary, so the receiver model should be checked before replacing remotes in bulk.
Compatible With
- LiftMaster 333LM and 333LMC 315 MHz three-button remote applications
- Select LiftMaster commercial door operator systems using 315 MHz open-close-stop radio control
- LiftMaster 323LM / 323LMC three-channel receiver applications when configured for a commercial door opener
- Select compatible 315 MHz receiver applications where 333LM is listed
- Commercial door installations requiring separate open, close, and stop commands
- Replacement path may include 813LMX for supported legacy systems
Features & Specifications
| Manufacturer | LiftMaster / Chamberlain |
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| Product Type | 3-button open-close-stop remote control |
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| Part Number | 333LM |
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| Application | Commercial door radio control |
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| Frequency | 315 MHz |
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| Buttons | 3 |
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| Common Button Use | Open, close, stop |
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| Related Receiver | 323LM / 323LMC where applicable |
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| Notes | Verify receiver compatibility and programming method |
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Also Known As / Related Part Numbers
- 333LM
- 333LMC
- LM-333LM
- LiftMaster 333LM remote
- LiftMaster 333LMC remote
- LiftMaster 315 MHz open close stop remote
- 813LMX related replacement path
- 813LM related commercial remote family
- 323LM related receiver
- 323LMC related receiver
Technician Note
For a 333LM to work correctly, the receiver must be able to process the separate channels and the commercial operator must be wired for the desired open, close, and stop functions. Matching frequency alone is not enough.
Before Ordering Checklist
- Confirm the installed receiver supports 315 MHz 333LM / 333LMC remotes
- Confirm the application needs open, close, and stop buttons
- Check whether the receiver is a 323LM / 323LMC or another compatible three-channel receiver
- Verify programming instructions for the exact receiver
- Do not substitute a 390 MHz 33LM unless the receiver supports that frequency
Professional Advisory
Remote control of commercial doors must be used with the required monitored safety devices and properly functioning stop control. If the door movement is unsafe or the stop command does not respond correctly, service the operator before adding remotes.
Important Ordering Warnings
- Not a universal LiftMaster remote
- Not for 390 MHz-only receiver systems
- Not for yellow learn button Security+ 2.0 residential openers unless a compatible commercial receiver setup is installed
Questions & Answers
The 333LM is commonly used as a 315 MHz commercial open-close-stop remote.
Is 333LM the same as 333LMC?
333LM and 333LMC are commonly treated as related LiftMaster/Chamberlain commercial three-button remote references.
Can this be used with a 323LM receiver?
It may be used with compatible 323LM / 323LMC three-channel receiver applications when configured for commercial door control.
Does this replace a 33LM?
Not directly in every case. 33LM is commonly associated with 390 MHz systems, while 333LM is a 315 MHz remote. Verify receiver frequency.
Why are there three buttons?
The three buttons are typically used for separate open, close, and stop commands on compatible commercial door control systems.
