CODE
31 *
MEANING
SOLUTION
Control board error
Remove power for 15 seconds. If code continues,
replace control board.
Check the operator cable connections, then reprogram
the limits.
Check for an obstruction, then reprogram the limits.
34
Absolute Position Issue
35
Max-Run-Time Exceeded
36
Product ID Error
Was the control board just replaced? If so, erase limits,
enter limit setup mode and set limits. If not, disconnect
all power, wait 15 seconds, then reconnect power
before changing product ID harness.
37
Product ID Failure
Unplug product ID harness then plug back in.
Disconnect all power, wait 15 seconds, then reconnect
power before replacing product ID harness.
38 *
Hard Stop
Limit may be set too tightly against a hard stop
(re-adjust limit). Operator may be at end of travel
(re-adjust mounting).
40
Battery overvoltage
41
Battery overcurrent
Possible short of the battery charge harness. Check
harness. Make sure you do NOT have a 12V battery
on a 24V system.
42
No battery at boot up
Check battery connections. Replace batteries if
depleted to less than 10V on 12V system or 20V on
24V system.
43
Failure or missing exit loop
(SHORT or OPEN - LiftMaster Plug-in Loop Detector
44
Failure or missing shadow loop
only) Check loop wiring throughout connection. May
45
Failure or missing interrupt loop
46
Low batteries in wireless edge
Replace batteries
47
Battery shorted
Check battery harness for short to chassis.
50
Run-Distance Error
53
Input voltage too low
Gate unbalance detected. Make sure the gate is installed
on a level surface and not on an excessive grade.
Review power supply and wiring. If rebooting,
wait for 15 seconds then reconnect power.
54
Wireless Second Operator
Communication Error
Check the second operator for power. If OFF, restore
power and try to run the system. If powered, deactivate
the wireless feature and then re-learn the second
operator.
60
No external entrapment protection
devices installed
Install at least one entrapment protection device (and
ensure all entrapment zones are protected).
61
be a short in the loop, or an open connection in the loop.
WIRING
DIAGRAM
CLOSE EYE/INTERRUPT (main board) Input held > 3 minutes. Check input on main board,
check for alignment or obstruction.
62
CLOSE EDGE (main board)
63
OPEN EYE/EDGE (main board)
64
65
CLOSE Edge
CLOSE EYE/EDGE
Input held > 3 minutes. Check input on main board;
check for alignment or obstruction.
66
OPEN EYE/EDGE
67
Wireless edge input stuck on
Check input for wiring issue or obstruction.
68
Wireless edge lost signal
Check batteries, reposition edge receiver for clearer
path to operator antenna.
69 *
Wireless edge triggered
Remove obstruction, check inputs and wiring.
70 *
CLOSE EYE/INTERRUPT reversal,
preventing close, or resetting TTC
71 *
CLOSE EDGE triggered reversal,
preventing close, or cancelling TTC
IF an obstruction occurred, no action required.
If an obstruction did NOT occur, check
alignment, inputs, and wiring.
72 *
OPEN EYE/EDGE reversal or
preventing opening
73 *
CLOSE EYE/INTERRUPT reversal,
preventing close, or resetting TTC
(expansion board)
74 *
CLOSE EYE/EDGE reversal and
preventing close or cancelling TTC
(expansion board)
75 *
OPEN EYE/EDGE reversal or
preventing opening (expansion board)
80
Close input (EYE/EDGE) fault
(Secondary operator)
81
Open input (EYE/EDGE) fault
(Secondary Operator)
82
Close input (EYE/EDGE) fault
(expansion board)
83
Open input (EYE/EDGE) fault
(expansion board)
91
Force reversal
93
Force reversal (RPM)
99
RSL12VDC
Normal Operation
Check the connections between the main board and
the secondary operator.
Check the connections between the main board and
the expansion board.
Check for obstruction. If no obstruction, check that the
operator arm is engaged and free to move. Check
actuator's wiring. Refer to Limit and Force Adjustment
section, and Obstruction Test sections in owner’s
manual.
No action required
* Codes marked with an asterisk are displayed in real time (as the condition occurs) and will not
be saved in memory.
01-37331B
Antenna
Loop Detector Diagnostics
(Model LOOPDETLM )
BLUE LED
1 Blink
(every 10
seconds)
WHITE LED
OFF
Coaxial Antenna Cable
EXPLANATION
Normal Operation
CONTROL BOARD
Jumper Wire
ANTENNA
+
+
2 Blinks
Rapid Blinks
(active fault) or OFF
3 Blinks
Rapid Blinks
(active fault) or OFF
4 Blinks
Rapid Blinks
(active fault)
+
Open Loop
+
Shorted Loop
+
Failed
Authentication
-
-
OFF
Slow Blinks
Loop detector is in
TEST or PROG mode
-
Edge
Successful Reset
+
Photoelectric Sensors
Edge
+
A
Primary/Secondary link
to other gate operator
B
COM
LINK
Active Loop
Shielded
Twisted
Pair Cable
J25
Black
Red
To J25
Ground the shield of the
cable to the chassis ground
of each operator.
Yellow
AC & BATT FAIL
BACKDRIVE
Black
Blue
Red
Transformer
Black
Black
Blocking
Diode
Red
White
Black
White
Black
12V 7AH Battery
Product ID
Red
Red
Piezo Alarm
Red
To Pin 2
-
To Pin 1
To Pin 6
+
-
Run
+
To Pin 5
One, two, or three 10W Solar Panels wired
in parallel (30W maximum)
Stop/Reset
APS Encoder
Reset Switch
Red
Accessory Power
Outlets
1/8 HP 12 Vdc Motor
EXPANSION BOARD
(Optional)
Black
TO MAIN
BOARD
Heater
OPEN
CLOSE
Green
POWER
1
EYE
ONLY
2
EYE/
EDGE
3
EYE/
EDGE
EYE
EDGE OR EYE
EDGE OR EYE
COM
OPN
GND
N
L
L
N
GND
SBC
CLS
STP
N.C.
Field Wiring
White
Loop
Detector
COM
Input Power Connection
SHADOW INTERUPT
Jumper Wire
EXIT
Field Wiring
Wire Loop
Wire Loop
Wire Loop
Field Wiring
©2014 LiftMaster
All Rights Reserved
WARNING: See Installation Manual
regarding maintenance and required
safety testing prior to servicing.
Field Wiring
+
2 Blinks
Solid
Photoelectric Sensors
+
-
OFF
Solid
N.C.
-