LiftMaster Automobile Parts 412HM User Manual

The receiver can be powered with either 24V AC/DC or with 12V
DC. The jumper must be in the 24V position for use with 24V,
and in 12V position for use with 12 VDC. 

The jumper must be set

to the proper voltage to avoid damage to the receiver.

The receiver is factory set at 24V. 

Figure 1.

The 412HM Universal Receiver can be used with up to 15 rolling
code transmitters or passwords in HIGH security mode.
Alternately, it can be used with up to 31 of any type transmitter in
NORMAL security mode, including any combination of rolling
code, billion code, or dip switch remotes.

The jumper must be set at the HIGH position for the receiver to
operate in HIGH security mode. It must be set at NORMAL 
position to operate at the NORMAL mode. 

Figure  2.

When changing from NORMAL to HIGH security mode, any 
previous transmitter codes must be erased. Repeat Steps 2 and
3 on Side 2 to reprogram the receiver for each remote control
transmitter in use.

The receiver is factory set at HIGH.

The use of 24V with the jumper in 12V position will cause permanent
damage to the receiver.

To prevent possible SERIOUS INJURY or DEATH from electrocution:
• Be sure power is not connected BEFORE installing the receiver.

To prevent possible SERIOUS INJURY or DEATH from a moving
gate or garage door:

• ALWAYS keep remote controls out of reach of children. NEVER 

permit children to operate, or play with remote control transmitters.

• Activate gate or door ONLY when it can be seen clearly, is properly

adjusted, and there are no obstructions to door travel.

• ALWAYS keep gate or garage door in sight until completely closed.

NEVER permit anyone to cross path of moving gate or door.

Power Supply 
Terminals

Circuit
Board

Jumper

Security Mode
Terminals

Jumper

Power Supply 
Terminals

Circuit
Board

Jumper

For commercial applications, the receiver can be set for either
constant or momentary closure on the output contacts. Use of
constant closure is prohibited on residential garage door openers
because it overrides the safety reversal devices.

With the jumper in the “M” (Momentary) position, the contacts 
will close for 1/4 second regardless of the length of radio
transmission. With the jumper in “C” (Constant) position, 
the contacts will stay closed as long as the radio continues
transmitting. 

Figure 3.

The receiver is factory set at M.

To prevent possible SERIOUS INJURY or DEATH, the use of 
CONSTANT OPERATION on residential openers is PROHIBITED.

Output
Duration
Terminals

Jumper

Output
Duration
Terminals

Jumper

NOTICE:  To comply with FCC and or Industry Canada rules, adjustment or modifications of this
receiver and/or transmitter are prohibited, except for changing the code setting or replacing the 
battery.  THERE ARE NO OTHER USER SERVICEABLE PARTS.
Tested to Comply with FCC Standards FOR HOME OR OFFICE USE.  Operation is subject to the 
following two conditions:  (1) this device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired operation.

Security Mode
Terminals

Jumper