LiftMaster LA500 Residential / Light Commercial Swing Gate Operator - Manual (Page 45)

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TROUBLESHOOTING CHART
TROUBLESHOOTING
FAULT POSSIBLE CAUSES CORRECTIONS
Gate opens, but will
not close.
a) Check DIAGNOSTIC LEDs
b) Open control active
c) Close Entrapment Protection Device active
d) Vehicle loop detector active
e) Loss of AC power with AC FAIL set to OPEN
f) Low battery with LOW BATT set to OPEN
g) Fire Dept input active a) Use Diagnostic code to identify issue
b) Check all Open inputs for an active input
c) Check all Entrapment Protection Device inputs for an active sensor
d) Check all vehicle detector inputs for an active detector
e) Check AC power and AC Fail option setting
f)
Battery voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or
replace batteries
g) Check Fire Dept input
Gate closes, but will
not open.
a) Check DIAGNOSTIC LEDs
b) Open Entrapment Protection Device active
c) Vehicle loop detector active
d) Low battery with LOW BATT switch set to close
e)
Low battery with LOW BATT option set to
CLOSE
a) Use Diagnostic code to identify issue
b) Check all Entrapment Protection Device inputs for an active sensor
c) Check all vehicle detector inputs for an active detector
d) Battery voltage must be 22.0 Vdc or higher
e)
Check if AC power is available. If no AC power, then running on batteries and battery
voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or replace
batteries
Gate does not close
from Timer-to-Close.
a) Timer-to-Close not set
b) Open control active
c) Close Entrapment Protection Device active
d) Vehicle loop detector active
e) Loss of AC power with AC FAIL set to OPEN
f) Low battery with LOW BATT option set to OPEN
g) Fire Dept input active a) Check Timer-to-Close (TTC) setting
b) Check all Open inputs for an active input
c) Check all Entrapment Protection Device inputs for an active sensor
d) Check all vehicle detector inputs for an active detector
e) Check AC power and AC Fail option setting
f)
Check if AC power is available. If no AC power, then running on batteries and battery
voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or replace
batteries.
g) Check Fire Dept input
Vehicle Exit loop
activation does not
cause gate to open.
a) Check DIAGNOSTIC LEDs
b) Exit vehicle detector setup incorrectly
c) Defective Exit loop detector or loop wire
d)
Low battery with LOW BATT option set to
CLOSE
a) Use Diagnostic code to identify issue
b) Review Exit loop detector settings. Adjust settings as needed.
c) Check Exit loop wire. Replace defective Exit loop detector.
d)
Check if AC power is available. If no AC power, then running on batteries and battery
voltage must be 22.0 Vdc or higher. Charge batteries by AC or solar power or replace
batteries.
Vehicle Interrupt
loop does not cause
gate to stop and
reverse.
a) Check DIAGNOSTIC LEDs
b) Vehicle detector setup incorrectly
c) Defective vehicle loop detector or loop wire a) Use Diagnostic code to identify issue
b) Review Interrupt loop detector settings. Adjust settings as needed
c) Check Interrupt loop wire. Replace defective Interrupt loop detector
Vehicle Shadow loop
does not keep gate
at open limit.
a) Check DIAGNOSTIC LEDs
b) Vehicle detector setup incorrectly
c) Defective vehicle loop detector or loop wire a) Use Diagnostic code to identify issue
b) Review Shadow loop detector settings. Adjust settings as needed
c) Check Shadow loop wire. Replace defective Shadow loop detector
Obstruction in gates
path does not cause
gate to stop and
reverse
a) Force setting too high a) Adjust force setting. Retest that obstruction in gate’s path causes gate to stop and reverse
direction.
Photoelectric sensor
does not stop or
reverse gate.
a) Incorrect photoelectric sensor wiring
b) Defective photoelectric sensor a) Check photoelectric sensor wiring. Retest that obstructing photoelectric sensor causes
moving gate to stop, and may reverse direction.
b) Replace defective photoelectric sensor. Retest that obstructing photoelectric sensor causes
moving gate to stop, and may reverse direction.
Edge Sensor does
not stop or reverse
gate.
a) Incorrect edge sensor wiring
b) Defective edge sensor a) Check edge sensor wiring. Retest that activating edge sensor causes moving gate to stop
and reverse direction.
b) Replace defective edge sensor. Retest that activating edge sensor causes moving gate to
stop and reverse direction.