LiftMaster LA500 Residential / Light Commercial Swing Gate Operator - Manual (Page 44)

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TROUBLESHOOTING
FAULT POSSIBLE CAUSES CORRECTIONS
Operator does not
run and diagnostic
LED not on.
a) No power to control board
b) Open fuse
c) If on battery power only, low or dead batteries
d) Defective control board
a) Check AC and battery power
b) Check fuses
c) Charge batteries by AC or solar power or replace batteries
d) Replace defective control board
Control board powers
up, but motor does
not run.
a) Check DIAGNOSTIC LEDs
b) Reset button is stuck
c) Stop button active
d) If on battery power only, low or dead batteries
e) Open or Close input active
f) Entrapment Protection Device active
g) Vehicle loop detector or probe active
h) Defective control board
a) Use Diagnostic code to identify issue
b) Check Reset button
c) Check Stop button is not “stuck on”
d) Charges batteries by AC or solar power or replace batteries
e) Check all Open and Close inputs for a “stuck on” input
f) Check all Entrapment Protection Device inputs for a “stuck on” sensor
g) Check all vehicle detector inputs for a “stuck on” detector
h) Replace defective control board
Relay clicks with
command, but motor
does not turn on.
a) Arm jammed or not connected
b) Defective motor or motor wires
c) Defective control board
a) Disengage the arm and ensure arm moves freely
b) Inspect motor wires for open wire, shorted wires, damage, etc. Else, replace arm.
c) Replace defective control board.
Arm moves, but
cannot set correct
limits.
a) Arm does not extend or retract enough during
travel
b) Arm is interfering with mounting bracket
c) Gate is too difficult to move
a) Disengage the arm and ensure arm moves freely
b) Examine the hinge point where the arm mounts to the gate post. Make sure that the
arm housing does not hit or interfere with the gate post or mounting bracket. Correct
as necessary.
c) Disconnect arm from gate and move gate manually. Gate must move easily and freely
through its entire range, limit-to-limit. Repair gate as needed.
Gate does not fully
open or fully close
when setting limits.
a) Arm does not extend or retract enough during
travel
b) Arm is interfering with mounting bracket
c) Gate is too difficult to move
a) Disengage the arm and ensure arm moves freely
b) Examine the hinge point where the arm mounts to the gate post. Make sure that the
arm housing does not hit or interfere with the gate post or mounting bracket. Correct
as necessary.
c) Remove arm from gate and move gate manually. Gate must move easily and freely
through its entire range, limit-to-limit. Repair gate as needed.
Operator does not
respond to a wired
control/command
(example: Open,
Close, SBC, etc.)
a) Check DIAGNOSTIC LEDs
b) Check Open and Close command input LEDs
c) Stop button is active
d) Reset button is stuck
e) If on battery power only, low or dead batteries
f) Entrapment Protection Device active
g) Vehicle loop detector or vehicle probe active
h) Defective control board
a) Use Diagnostic code to identify issue
b) Check all Open and Close inputs for a “stuck on” input
c) Check Stop button is not “stuck on”
d) Check Reset button
e) Charges batteries by AC or solar power or replace batteries
f) Check all Entrapment Protection Device inputs for a “stuck on” sensor
g) Check all vehicle detector inputs for a “stuck on” detector
h) Replace defective control board
Operator does not
respond to a wireless
control or transmitter
a) Check DIAGNOSTIC LEDs
b)
Check XMITTER LED when wireless control is
active
c) Stop button is active
d) Reset button is stuck
e) Poor radio reception
f) Defective control board
a) Use Diagnostic code to identify issue
b) Activate wireless control and check XMITTER LED is on. Re-learn wireless control/
transmitter to control board. Replace wireless control as needed.
c) Check Stop button is not “stuck on”
d) Check Reset button
e) Check if similar wired control operates correctly. Check if wireless controls works
properly when within a few feet of operator. Check operator’s antenna and antenna
wire. Check other wireless controls or devices.
f) Replace defective control board
Gate stops during
travel and reverses
immediately.
a) Check DIAGNOSTIC LEDs
b) Inherent force obstruction detection
c)
E xternal Entrapment Protection Device
activation
d) Control (Open, Close) becoming active
e) Vehicle loop detector active
f) Low battery voltage
a) Use Diagnostic code to identify issue
b) Check for obstruction in gate’s path or travel. Remove arm from gate and move gate
manually. Gate must move easily and freely through its entire range, limit-to-limit.
Remove obstruction or repair gate as needed.
c) Check all Entrapment Protection Device inputs for an active sensor
d) Check all Open and Close inputs for an active input
e) Check all vehicle detector inputs for an active detector
f) Battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or
replace batteries
TROUBLESHOOTING CHART