LiftMaster LA500 Residential / Light Commercial Swing Gate Operator - Manual (Page 46)

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TROUBLESHOOTING CHART
TROUBLESHOOTING
FAULT POSSIBLE CAUSES CORRECTIONS
Alarm sounds for 5 minutes
or alarm sounds with a
command.
a) Double entrapment occurred a) Check for cause of entrapment (obstruction) detection and correct. Press the
reset button to shut off alarm and reset the operator.
Alarm beeps three times
with a command.
a) Low battery a) 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
On dual-gate system, one
gate is not commanding the
other.
a) Defective or incorrect Operator-to-Operator
wiring
b) Incorrect Operator-to-Operator wireless
learning
a) Check operator-to-operator wiring.
b) Relearn the wireless network of one operator to the other operator.
On dual-gate system,
incorrect gate opens first or
closes first.
a) Incorrect Bipart switch setting a) Change setting of both operator’s Bipart switch settings. One operator should
have Bipart switch ON (operator that opens second) and the other operator
should have Bipart switch OFF (operator that opens first)
Alarm beeps when running.
Expansion board function not
controlling gate.
a) Defective main board to expansion board
wiring
b) Incorrect input wiring to expansion board
c)
Defective expansion board or defective main
board
a) Check main board to expansion board wiring. If required, replace wire cable.
b) Check wiring to all inputs on expansion board.
c) Replace defective expansion board or defective main board
Maglock not working
correctly.
a) Maglock wired incorrectly a) Check that Maglock is wired to N.C. and COM terminals. Check that Maglock has
power (do not power maglock from control board accessory power terminals). If
shorting lock’s NO and COM wires does not activate Maglock, then replace
Maglock or Maglock wiring
Solenoid lock not working
correctly.
a) Solenoid wired incorrectly a) Check that Solenoid is wired to N.O. and COM terminals. Check that Solenoid has
power (do not power solenoid from control board accessory power terminals). If
shorting lock’s NC and COM wires does not activate Solenoid, then replace
Solenoid lock or Solenoid wiring
Switched (SW) Accessory
power remaining on.
a) In limit setup mode a) Learn the limits
Accessories connected to
Switch (SW) Accessory
power not working correctly,
turning off, or resetting.
a) Normal behavior a) Move accessory to accessory power "ON"
Accessories connected to
Accessory power not
working correctly, turning
off, or resetting.
a) Accessory power protector active
b) Defective control board a) Disconnect all accessory powered devices and measure accessory power voltage
(should be 23 – 30 Vdc). If voltage is correct, connect accessories one at a time,
measuring accessory voltage after every new connection.
b) Replace defective control board
Quick Close not working
correctly.
a) Quick Close setting incorrect
b) Interrupt loop detector or loop wire defective
c) Defective Expansion board a) Check that Quick Close setting is ON
b) Check operation of Interrupt Loop detector
c) Replace defective Expansion board
Anti-Tailgating not working
correctly.
a) Anti-Tail setting incorrect
b) Interrupt loop detector or loop wire defective
c) Defective Expansion board
a) Check that Anti-Tail setting is ON
b) Check operation of Interrupt Loop detector
c) Replace defective Expansion board
AUX Relay not working
correctly.
a) AUX Relay setting incorrect
b) AUX Relay wiring incorrect
c) Defective Expansion board a) Check AUX Relay switches settings
b) Check that wiring is connected to either N.O. and COM or to N.C. and COM.
c) Set AUX Relay to another setting and test. Replace defective expansion board.