LiftMaster 312HM Receiver for 371LM, 372LM, 373LM and Compatible 315 MHz Accessories
The LiftMaster 312HM is a 315 MHz external radio receiver used to add or restore radio-control capability on compatible gate operators, commercial door operators, and access-control systems. It is especially useful where the operator needs a receiver that can accept compatible LiftMaster 315 MHz remote controls or keypad transmitters and provide a relay output back to the operator control board.
In the field, this receiver is commonly used when the operator itself is still working but the radio receiver is missing, damaged, outdated, or no longer communicating with the customer remote controls. It gives the installer a serviceable receiver box with jumper-selectable power and output behavior, which makes it practical for many low-voltage control circuits used on gate and commercial operator equipment.
The important point with this receiver is radio technology. The 312HM is tied to the 315 MHz LiftMaster receiver family and should not be confused with 390 MHz receivers, Security+ 2.0 yellow learn-button accessories, tri-band encrypted commercial remotes, or older DIP-switch receivers unless the receiver documentation specifically supports that mode. Match the customer transmitter family and the operator wiring requirements before replacing a receiver.
What This Part Does
The 312HM receives a signal from a compatible remote, keypad, or access transmitter and sends a control signal to the operator through its relay output. Depending on the application, that output may be used for open, close, single-button step operation, or another low-voltage control input on the operator.
It is commonly used as an add-on receiver for operators that do not have an onboard compatible radio receiver, or as a replacement receiver when the existing 315 MHz receiver is no longer reliable.
Compatible With
Compatible applications should be checked by radio technology, receiver wiring, and operator control input. The following compatibility items are commonly associated with the 312HM receiver family.
- LiftMaster 371LM 1-button Security+ 315 MHz remote controls
- LiftMaster 372LM 2-button Security+ 315 MHz remote controls
- LiftMaster 373LM 3-button Security+ 315 MHz remote controls
- LiftMaster 373P 315 MHz remote references where the receiver chart lists 373P support
- LiftMaster 377LM wireless keypad applications that use the compatible 315 MHz receiver family
- LiftMaster KPW250 wireless commercial keypad applications where programmed to the compatible receiver technology
- LiftMaster 877MAX / 878MAX keypad applications when programmed for the compatible 315 MHz receiver mode
- LiftMaster 890MAX, 893MAX, and 895MAX remote applications when programmed for the compatible LiftMaster 315 MHz receiver mode
- LiftMaster commercial garage door operators that use an external 315 MHz receiver input
- LiftMaster gate operator applications that accept an external dry-contact receiver output
- Older LiftMaster gate operator families commonly associated with 312HM receiver references, including select SW, SL, MSL, MSLX, VSL, HS, and Miracle-One style installations when the receiver and wiring match
- Operator model generations with built-in or add-on 312HM receiver references, including model suffix families commonly identified with G3, UL3, or H3 receiver generations
Because receiver compatibility depends on the transmitter frequency, radio code family, relay wiring, and operator control input, this receiver should be verified against the existing receiver label or the operator wiring diagram before ordering.
Also Known As / Related Part Numbers
The following numbers and names are commonly used around this receiver listing or compatible accessory family. They are not all identical products, so use the list as a cross-reference guide rather than a guarantee of interchange.
- 312HM
- 312HMC
- 012381993123
- LiftMaster 312HM receiver
- 315 MHz LiftMaster receiver
- 371LM
- 372LM
- 373LM
- 373P
- 377LM
- KPW250
- 877MAX
- 878MAX
- 890MAX
- 893MAX
- 895MAX
Features and Specifications
| Feature / Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | External radio receiver |
| Part Number | 312HM |
| Application | Gate operator, commercial door operator, and access control receiver applications |
| Frequency | 315 MHz |
| Compatible Technology | LiftMaster Security+ 315 MHz / compatible receiver modes |
| Power | 12VDC or 18-35VAC/DC jumper-selectable applications where supported |
| Output | Momentary or constant-contact relay selection where supported |
| Memory | Commonly referenced with high-security and normal-security memory modes |
| Notes | Verify transmitter family and operator wiring before ordering |
Technician Note
When a customer says a remote will not program, confirm whether the receiver is actually a 312HM and not a 390 MHz receiver, 412HM receiver, Security+ 2.0 receiver, STAR1000, 850LM, or 860LM. Similar-looking radio parts can use different frequencies and code families.
Before Ordering Checklist
- Match the receiver label to 312HM or 312HMC when replacing an existing receiver.
- Confirm the customer remotes or keypads are compatible 315 MHz LiftMaster accessories.
- Check available power at the operator before wiring the receiver.
- Confirm whether the operator input needs momentary contact or another control behavior.
- Do not bypass monitored entrapment protection or safety circuits while troubleshooting receiver operation.
Professional Advisory
Receiver wiring should be handled through the low-voltage control circuit only. If the operator cabinet has high-voltage exposure, missing safety devices, water damage, or unsafe gate movement, have a qualified gate or commercial door technician inspect the system before returning it to service.
Product Questions and Answers
Will the 312HM work with my 371LM or 373LM remote?
Yes, the 312HM is commonly associated with 315 MHz LiftMaster accessories such as 371LM, 372LM, and 373LM when the receiver and remote are programmed in the matching mode.
Can I use the 312HM on a gate operator?
Yes, it may be used on compatible gate operators that accept an external receiver relay output and have the proper low-voltage power available.
Is the 312HM the same as a 412HM receiver?
No. The 312HM and 412HM receiver families are different references and should not be treated as automatic substitutes.
Will this receiver make an older operator work with every new LiftMaster remote?
No. The remote must support the radio technology used by the receiver. Universal MAX remotes may work only when programmed to the correct compatible mode.
What should I check before replacing the receiver?
Check the existing receiver label, transmitter model numbers, operator input terminals, power requirements, and whether the operator already has a built-in receiver.
