Chamberlain LiftMaster 915LM

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CLOSED

OPEN

Indoor Receiver

AC Adapter

Sensor

CR2032

3 VOLTS

Lithium Battery

(CR2032 type)

Double-Sided

Fastening Strip

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.

WARNING

CAUTION

WARNING

GARAGE DOOR

MONITOR SYSTEM

PRE-INSTALLATION SYSTEM TEST

1. The sensor and receiver are pre-matched (programmed) at the

factory. Test the system by flipping the sensor over while it is a

few feet away from the receiver. The receiver will show a

green light for closed when the sensor is face up in the vertical

position with the round end of the case pointing down

(Figure 1). The red light will flash when the sensor is face

down in the horizontal position (Figure 2).

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.

INSTALLING THE BATTERY IN THE GARAGE

DOOR INDICATOR SENSOR

1. Place the screw driver blade on the tab at

the end of the case and gently press down

and in toward the case.

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.

NOTE: It is normal to hear a rattle from the tilt

switch in the sensor 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

receiver.

2. The receiver has a 9" antenna

wire which comes out the back.

The antenna should be straight

and not touching metal.

Figure 1 Figure 2

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.

To ensure that your Garage Door Monitor continues to operate

properly, the following checks should be performed on a

monthly basis:

• Check that the sensor is mounted properly on the garage door

(see Mounting the Sensor 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.

• Check that the receiver is properly recognizing sensor

signals (see Troubleshooting section of this manual.)

Antenna

Learn

Button

Adapter

Location

MOUNTING THE SENSOR

Attach the sensor to the inside of the garage door using the

double-sided fastening strip. Mount the sensor 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.

Inside of Garage

Double-Sided Fastening Strip

Round End

Down

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.

Garage Door Monitor

Models 915LM • 916LM • 2C507-2

Need help?

Do you have a question about the Chamberlain LiftMaster 915LM and is the answer not in the manual?

Summary

General Safety Warnings

Garage Door Monitor System Setup

Installing the Battery in the Garage Door Indicator Sensor

Instructions for opening the sensor case, inserting the lithium battery, and reassembling the sensor.

Indoor Receiver Setup

Steps for connecting the AC adapter to the receiver and wall outlet for initial setup.

Pre-Installation System Test

Procedure to test sensor and receiver pairing by checking LED indicators in different positions.

Mounting the Sensor

Guidelines for attaching the sensor to the garage door using the provided fastening strip.

Garage Door Monitor Operation

Monitor Operation Details

Explains receiver LED behavior for open/closed status and sensor signal transmission frequency.

Learning More Than One Sensor

Step-by-step guide to program additional sensors to the receiver for multi-door monitoring.

Erasing or Clearing the Memory

Procedure to reset the receiver by clearing all previously programmed sensor memory.

Troubleshooting and Maintenance

Troubleshooting Sensor Issues

Addresses sensor battery replacement, loss of signal, and potential interference problems.

Troubleshooting System Malfunctions

Guidance for resolving sudden malfunctions, often related to low sensor battery power.

Optional Accessories and Specifications

Optional Accessories

Information on purchasing additional sensors for monitoring multiple garage doors.

Product Specifications

Details on sensor and receiver specifications including battery type, temperature ranges, and codes.