Chamberlain GCU User's Manual

Chamberlain Switch User's Manual - GCU.
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Overview

The Gate Control Unit (GCU) can be paired with the
Gate Access Panel (GAPLM) to wirelessly control a
gate operator.
The GCU is compatible with various Liftmaster
Wireless Products.

Step 2

Install 4 AA Alkaline batteries 
(not provided). (Lithium
batteries recommended for
colder environments.)

1

Model GCU

Gate Control Unit

Step 1

Remove cover.

Assembly

Gate Control Unit (GCU)

Within 20 seconds enter Master PIN Number on
GAPLM:

Followed by GCU Identity as determined in Step 3:

1

2

3

4

OR

OR

OR

The GCU LED will blink 3 times indicating
programming is successful. If error tone is heard or
GCU LED emits 3 double blinks, then programming
has failed.
Repeat for additional GCUs.

“BEEP” “BEEP”

Step 3

NOTE: This step applies only if more than one GCU
is being used.
Up to four GCUs can be used. Each GCU will need a
different Identity. Set the Identity of the GCU by
changing the Dipswitches as shown in the chart
below.

GCU ID

Switch #1

Switch #2

1

OFF

OFF

2

ON

OFF

3

OFF

ON

4

ON

ON

Dipswitches

Learn
Button

Step 4

Press the Learn button on the
GCU for one second. The LED
will light for 20 seconds.

LED

Programming to GAPLM

0.506390s