Garage Door Monitor
Models 915LM • 916LM • 2C507-2
Know when your garage door is open
or closed!
Thank you for purchasing the LiftMaster Garage Door Monitor.
Monitor the status of your garage door from inside your home.
No longer will you have to run downstairs or go outside just to
see if you or your children have left the garage door open.
WARNING
To prevent possible SERIOUS INJURY or DEATH from a closing
garage door:
• Activate door ONLY when it can be seen clearly, is properly
adjusted, and there are no obstructions to door travel.
• ALWAYS keep garage door in sight until completely closed. NEVER
permit anyone to cross path of closing garage door.
GARAGE DOOR
MONITOR SYSTEM
NOTE: Because radio control devices are inherently
susceptible to RF interference, this product should NOT be
used as a stand-alone security device. This product is
considered a monitoring and notification device ONLY, and as
such, should not be used as a substitute for a dedicated home
security system.
CLOSED
Transmitter
AC Adapter
OPEN
To ensure that your Garage Door Monitor continues to operate
properly, the following checks should be performed on a
monthly basis:
• Check that the transmitter is mounted properly on the garage
door (see “Mounting the Transmitter” section of this manual.)
• Ensure the 3 volt lithium battery is installed properly.
• Check to see that the receiver system is plugged into a wall
outlet and the jack is properly connected to the back of the
receiver. Make sure the antenna is straight and not in contact
with any metal objects.
CR2032
3
VOLTS
Lithium Battery
(CR2032 type)
Double-Sided Velcro
Indoor Receiver
PRE-INSTALLATION SYSTEM TEST
1. The transmitter and receiver are pre-matched (programmed)
at the factory. Test the system by flipping the transmitter over
while it is a few feet away from the receiver. The receiver will
show a green light for closed when the transmitter is face up
in the vertical position with the round end of the case
• Check that the receiver is properly recognizing transmitter
signals (see “Troubleshooting” section of this manual.)
pointing down (Figure 1). The red light will flash when the
transmitter is face down in the horizontal position (Figure 2).
INSTALLING THE BATTERY IN THE GARAGE
DOOR INDICATOR TRANSMITTER
2. If the green or the red receiver lights do not come on, or do
not react as described, see the Troubleshooting or Learning
section of these instructions.
1. Place the screw driver blade on the tab at
the end of the case and gently press down
and in toward the case.
Figure 1
Figure 2
2. Insert the the lithium battery into the battery
clip with the + (positive) side face up.
3. Push the case back together tightly by
inserting the top hooks into the back cover,
then snap shut the bottom of
the case.
MOUNTING THE TRANSMITTER
NOTE: It is normal to hear a rattle from the tilt
Attach the transmitter to the inside of the garage door using the
double-sided velcro. Mount the transmitter near the top of the
garage door for best results. The round end of the case should
be pointing down when the garage door is closed.
switch in the transmitter when tilted or rotated to another position.
INDOOR RECEIVER SETUP
1. Plug the AC adapter into any
standard 110 volt AC electrical
wall outlet and the small plug
into the back of the indoor
Double-Sided Velcro
Antenna
Learn
CLOSED
OPEN
receiver.
Button
2. The receiver has a 9" antenna
wire which comes out the
back. The antenna should be
straight and not touching
metal.
AC
Adapter
Location
Round End
Down
Inside of Garage
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