Troubleshooting - Chamberlain LA400 Owner's Manual

FAULT
1) Battery fuse is blown.
OPERATOR IS DEAD
2) Battery or Run Transformer
When power is supplied to
the control board, no LED
3) Dead battery.
turns ON.
4) Bad control board.
OPERATOR DOES NOT
1) Low battery.
RUN
2) Radio (remote) not programmed.
Unit does not respond to a
3) STOP button connection loose.
Radio command.
4) There is an obstruction blocking
5) Safety edge is damaged or on an
6) Interrupt loop is obstructed.
7) Bad control board.
8) Motor fuse is blown.
1) Low battery.
OPERATOR DOES NOT
2) SBC button connection loose.
RUN
3) STOP button connection loose.
Unit does not respond to
SBC command.
4) Obstruction is blocking the photoelectric ➤ Check gate area to ensure photoelectric eyes are not blocked.
5) The safety edge is damaged
6) Interrupt loop is obstructed.
7) Bad control board.
8) Motor fuse is blown.
1) Bad motor.
MOTOR DOES NOT RUN
2) Cable wiring between control and
Relays 'click' when Radio
or SBC signal is given, but
3) Bad control board.
the operator does not
4) Batteries not connected.
move.
1) A fault has occurred.
GATE STOPS AND
REVERSES RIGHT AFTER
2) Force set too low.
IT STARTS MOVING
1) Battery voltage low or near low
GATE STOPS RUNNING
RIGHT AFTER IT STARTS
MOVING (BATTERY RUN)
2) A fault has occurred.
1) An input is continuously activated.
GATE OPENS BUT DOES
NOT CLOSE
2) Entry system output is connected to
T R O U B L E S H O O T I N G
POSSIBLE CAUSE
connection is loose.
STOP LED is OFF.
photoelectric eyes in direction
of movement.
obstruction.
STOP LED is OFF.
eyes in the direction of movement.
or on an obstruction.
operator arm disconnected or loose.
voltage cut-off.
the Open input, and is "stuck" opening.
FIX
➤ Replace battery fuse. Use only 20A, ATC style fuse.
➤ Check battery and transformer connections.
➤ Measure voltage across battery > 23V.
➤ Replace control board.
➤ Measure voltage across battery > 23V.
➤ See Programming Remote section for programming instructions.
➤ Check STOP button connections (STOP and COM) to make sure they
are secure.
➤ Check gate area to ensure photoelectric eyes are not blocked.
➤ Check gate area to ensure safety edge is not resting on an obstruction.
Check safety edge wiring and connections.
➤ Check gate area to ensure path is unobstructed.
➤ Replace control board.
➤ Replace motor fuse. Use only 15A, ATC style fuse.
➤ Measure voltage across battery > 23V.
➤ Check SBC and COM connections to ensure they are secure.
➤ Check STOP button connections (STOP and COM) to make sure they
are secure.
➤ Check gate area to ensure safety edge is not resting on an obstruction.
Check safety edge wiring and connections.
➤ Check gate area to ensure path is unobstructed.
➤ Replace control board.
➤ Replace motor fuse. Use only 15A, ATC style fuse.
➤ Replace motor.
➤ Replace control board.
➤ Replace control board.
➤ Connect batteries.
➤ Check gate for obstructions.
➤ Adjust FORCE setting until gate completes a full open/close cycle
without reversing. The force setting may need to be adjusted in cold
weather, as the gate will not move as freely.
➤ Charge batteries. If problem persists, they may be near the end of their
life. Replace batteries. NOTE: Replace both batteries at the same time.
Use only Chamberlain part #K74-30762 for replacement batteries.
➤ Check gate for obstructions.
➤ Verify that all inputs are functioning properly.
➤ Verify Entry system connections and operation.
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