Troubleshooting Chart - Chamberlain LiftMaster LA412 Owner's Manual

TROUBLESHOOTING
OPERATOR DOES
NOT RUN.
DIAGNOSTIC LED
NOT ON.
OPERATOR POWERS
UP BUT DOES NOT
OPERATE.
RELAYS "CLICK" WHEN
REMOTE CONTROL OR
SINGLE BUTTON
CONTROL (SBC)
COMMAND IS GIVEN,
BUT THE OPERATOR
DOES NOT MOVE OR
GATE DISCONNECTED.
THE ARM MOVES BUT
CANNOT EXIT LEARN
LIMITS MODE.
CANNOT LEARN
LIMITS.
GATE DOES NOT
FULLY OPEN OR
CLOSE WHEN TRYING
TO LEARN LIMITS.
OPERATOR DOES
NOT RESPOND TO
SINGLE BUTTON
(SBC) COMMAND.
OPERATOR DOES NOT
RESPOND TO REMOTE
CONTROL COMMAND.
» TROUBLESHOOTING CHART
• Power not connected. Make sure the AC/Solar input is connected and that at least one battery is connected with the corresponding
fuse intact.
• Low or defective battery. Check the battery to make sure that the red wire goes to the positive terminal of the battery and the
black wire goes to the negative terminal of the battery. Replace the battery if the open circuit voltage is below 11.5 Vdc.
• Bad control board. Replace control board.
• Low or defective battery. At least one charged battery must be connected for the operator to operate. Verify the battery fuse is
intact. Check battery connections and battery voltage to be above 11.5 V. Replace batteries if necessary.
• STOP button connection loose or disconnected. Press the RESET button and verify that the STOP LED lights up and then turns off
after 10 seconds. Verify the wire connects between the STOP and CTRL PWR terminals.
• Obstruction blocking photoelectric sensors. Press the RESET button and verify that all the safety LEDs (OPEN EDGE/PHOTO, OPEN
PHOTO, CLOSE PHOTO) are OFF. If any are ON, clear any obstructions and verify the LED turns off.
NOTE: The RESET button may need to be hit multiple times since the LEDs turn off after 10 seconds when the operator goes to sleep.
• (Optional Accessory) Safety edge is damaged or on an obstruction. Press the RESET button and verify that the Safety LEDs
(OPEN EDGE and CLOSE EDGE/PHOTO) are OFF. If either is ON, clear any obstructions and verify the LED turns off.
NOTE: The RESET button may need to be hit multiple times since the LEDs turn off after 10 seconds when the operator goes to sleep.
• (Optional Accessory) Interrupt loop or Shadow loop is obstructed. Press the RESET button and verify that the INTERRUPT and
SHADOW LEDs are OFF. If either is on, check the loop detector and its wiring to insure that it is not incorrectly being triggered.
• Bad control board. Replace control board.
• Battery not connected. At least one charged battery must be connected for the operator to operate. Verify battery fuse is intact.
Check battery connections and battery voltage to be above 11.5 V. Replace batteries if necessary.
• Arm cable loose or disconnected. Verify that all of the wires, especially the red and blue wires, going to the arm are secure and
that the connector is properly mated to the header.
• Arm is jammed or incorrectly installed. Disconnect the motor housing from the arm and verify that the arm moves freely. With the
motor housing still disconnected, enter the Learn Limits mode and verify that the motor spins. Reconnect the motor housing to the
arm and make sure that all 4 screws are securely tightened and that the motor seats correctly against the worm drive. Relearn
limits for the operator.
• Bad control board. Replace control board.
• Arm does not extend or contract enough during travel. The arm piston must extend and contract close to its full length to Learn
Limits. Adjust the arm mounting so that this can be achieved.
• Motor cable wire not connected. Make sure that all the motor wires are connected properly.
• Motor housing is not properly seated. Make sure that the motor housing for the arm(s) is properly seated so there are no gaps
between the motor housing and arm assembly. Make sure all 4 screws are tightened.
• Over extending or contracting arm. Disconnect the motor housing from the arm and make sure that the arm moves freely
throughout the full length of travel. Adjust arm mounting and positioning if necessary.
• Arm is interfering with the gate mount bracket. 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 throughout the full length of travel. Adjust the
arm mounting and positioning if necessary.
• Gate is excessively heavy or hinges are bad. Verify that the gate is within the ratings for this product. Disconnect the arms and
verify that both gates swing easily. Lubricate or replace hinges as necessary.
• Battery not connected. At least one charged battery must be connected for the operator to operate. Verify the battery fuse is intact.
Check battery connections and battery voltage to be above 11.5 V. Replace batteries if necessary.
• STOP button connection loose or disconnected. Press the RESET button and verify that the STOP LED lights up and then turns off
after 10 seconds. Verify the wire connects between STOP and CTRL PWR terminals.
• Single Button Control (SBC) button connection loose. Check wiring for SBC button. Use the on-board single button to verify operator
will respond.
• Bad control board. Replace control board.
• Battery not connected. At least one charged battery must be connected for the operator to operate. Verify battery fuse is intact.
Check battery connections and battery voltage to be above 11.5 V. Replace batteries if necessary.
• STOP button connection loose or disconnected. Press the RESET button and verify that the STOP LED lights up and then turns off
after 10 seconds. Verify the wire connects between the STOP and CTRL PWR terminals.
• Radio module not plugged in. Verify the green Radio module (located next to the coaxial connector) is properly mated with both
4-pin connectors.
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