Troubleshooting Chart - Chamberlain LA500 Installation Manual

TROUBLESHOOTING
FAULT POSSIBLE CAUSES
Accessories a) Accessory power protector active
connected to
b) Defective control board
Accessory power
not working
correctly, turning
off, or resetting.
Quick Close not a) Quick Close setting incorrect
working correctly.
b) Interrupt loop detector or loop wire defective
c) Defective Expansion board
Anti-Tailgating not a) Anti-Tail setting incorrect
working correctly.
b) Interrupt loop detector or loop wire defective
c) Defective Expansion board
AUX Relay not a) AUX Relay setting incorrect
working correctly.
b) AUX Relay wiring incorrect
c) Defective Expansion board
CORRECTIONS
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
a) Check that Quick Close setting is ON
b) Check operation of Interrupt Loop detector
c) Replace defective Expansion board
a) Check that Anti-Tail setting is ON
b) Check operation of Interrupt Loop detector
c) Replace 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.
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TROUBLESHOOTING CHART