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WIRING DIAGRAM
Model RSW12UL
Press and hold
STOP...
...then press and
hold CLOSE...
...then press and hold OPEN
until "Er" shows.
CODE SEQUENCE NUMBER
The first number shown is the most
recent code (example: “01”). The
display will show the sequence of
codes that occurred starting with “01”
and going up to code “20”.
CODE NUMBER
The second number shown after the code
sequence number is the code itself
(31-99, example” “31”).
A SECOND LATER....
The operator will show the code sequence number followed by the code number:
Diagnostic Codes
TO VIEW THE CODES:
LiftMaster System
Installed System
Informational
External Entrapment Protection
Inherent Entrapment Protection
CODE MEANING SOLUTION
31
Main control board has experienced an internal
failure.
Disconnect all power, wait 15 seconds, then
reconnect power (reboot). If issue continues,
replace main control board.
32 Linear Drive Disengaged (Arm 1) Disengage then re-engage arm. Check wiring and
connections.
33 Linear Drive Disengaged (Arm 2)
34
Absolute Position Encoder Error, not getting
position information from encoder
Check the operator cable connections, then
reprogram the limits.
35
Max-Run-Time Exceeded Error Check for an obstruction, then reprogram the
limits.
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 (Arm 1) Limit may be set too tightly against a non-
resilient hard stop (re-adjust limit). Operator may
be at end of travel (re-adjust mounting).
39
Hard Stop Limit (Arm 2)
40
Battery overvoltage Too much voltage on the battery. Check harness.
Make sure there is NOT a 24V battery on a 12V
system.
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 and installation.
Replace batteries if depleted to less than 20V on
a 24V system or less than 10V on a 12V system.
Make sure there is NOT a single 12V battery on a
24V system.
43 Exit Loop Error Failure or missing loop (SHORT or OPEN -
LiftMaster Plug-in Loop Detector only) Check
loop wiring throughout connection. May be a
short in the loop, or an open connection in the
loop.
44 Shadow Loop Error
45
Interrupt Loop Error
46 Wireless edge battery low Replace batteries in wireless edge.
50
Run-Distance Error Gate unbalance detected. Make sure the gate is
installed on a level surface and not on an
excessive grade.
51 Pass-point not detected (Arm 1) Check yellow pass-point wiring. If limits are not
accurate, reprogram.
52 Pass-point not detected (Arm 2)
53
Brownout occurred AC/DC board supply dipped below allowable
level. Review power supply and wiring. If
rebooting, ensure enough time for discharge of
power to force a fresh boot.
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
reprogram the second operator.
60
Minimum number of monitored entrapment
protection devices not installed.
Review monitored entrapment protection device
connections. This swing gate operator will
operate only after installation of a minimum of
one external safety device in either the open or
close direction.
61
CLOSE EYE/INTERRUPT held more than 3
minutes
Check wired input on main control board; check
for alignment or obstruction.
62 CLOSE EDGE held more than 3 minutes
63 OPEN EYE/EDGE held more than 3 minutes
64
CLOSE EYE/INTERRUPT held more than 3
minutes
Check wired input on expansion board; check for
alignment or obstruction.
65 CLOSE EYE/EDGE held more than 3 minutes
66 OPEN EYE/EDGE held more than 3 minutes
67
Wireless edge triggered more than 3 minutes Check wired input for wiring issue or
obstruction.
68 Wireless edge loss of monitoring Check wireless edge inputs.
69
Wireless edge triggered IF an obstruction occurred, no action required. If
an obstruction did NOT occur, check inputs and
wiring.
70
CLOSE EYE/INTERRUPT triggered, causing
reversal, preventing close, or resetting TTC
IF an obstruction occurred, no action required. If
an obstruction did NOT occur, check alignment,
inputs, and wiring on main control board.
71
CLOSE EDGE triggered, causing reversal,
preventing close, or canceling TTC
72
OPEN EYE/EDGE triggered, causing reversal or
preventing opening
73
CLOSE EYE/INTERRUPT triggered, causing
reversal, preventing close, or resetting TTC
IF an obstruction occurred, no action required. If
an obstruction did NOT occur, check alignment,
inputs, and wiring on expansion board.
74
CLOSE EYE/EDGE triggered, causing reversal
and preventing close or canceling TTC
75
OPEN EYE/EDGE triggered, causing reversal or
preventing opening
80
Close input (EYE/EDGE) communication fault
from other operator
Check inputs and communication method
between operators, either wired bus or radio.
Ensure operator is powered. May have to erase
the wireless communication and reprogram the
two operators.
81
Open input (EYE/EDGE) communication fault
from other operator
82
Close input (EYE/EDGE) communication fault
(expansion board)
Check the connections between the main board
and the expansion board.
83
Open input (EYE/EDGE) communication fault
(expansion board)
84
Non-monitored device detected on the wireless
safety system
Non-monitored contact closure devices are not
supported. Make sure connected devices are
monitored. Check edges for proper orientation
and resistive end cap connection.
91 Force Reversal (Operator 1) Check for obstruction. If no obstruction, check
that the mechanical assembly is engaged and
free to move. See section on Limit and Force
Adjustment, and Obstruction Test in the manual.
92
Force Reversal (Operator 2)
93 RPM / STALL Reversal (Operator 1) Check for obstruction. If no obstruction, check
the operator wiring and that the mechanical
assembly is engaged and free to move. Replace
APE assembly.
94
RPM / STALL Reversal (Operator 2)
99 Normal Operation No action required
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