Troubleshooting Chart - Chamberlain LiftMaster LA412 Owner's Manual

TROUBLESHOOTING
OPERATOR DOES NOT
RESPOND TO REMOTE
CONTROL COMMAND.
GATE STOPS
AND REVERSES
IMMEDIATELY AFTER IT
STARTS MOVING.
GATE OPENS BUT
DOES NOT CLOSE.
GATE DOES NOT
CLOSE
AUTOMATICALLY
WITH TIMER TO CLOSE
ENABLED.
ALARM CONSTANTLY
SOUNDS 5 MINUTES.
SOUNDS WHENEVER A
COMMAND IS ISSUED.
ALARM IS BEEPING 3
TIMES ON A
COMMAND
GATE RUNS TOO
SLOW
GATE 2 CLOSES
BEFORE GATE 1.
ALARM BEEPS
WHEN RUNNING.
» TROUBLESHOOTING CHART
• Antenna not connected. Verify the antenna and coaxial cable are properly connected to the control board.
• Remote control not learned. Refer to Programming Remote Control section.
• Bad control board. Replace control board.
• Obstruction sensed. Check safety devices and gate for obstructions.
• A fault has occurred. Check Diagnostic LED for possible error codes.
• Force set too low. 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 freely.
• Loops are reversed. Make sure that the Safety loop and Shadow loop are connected properly. The gate may trigger the Shadow loop as
it moves, so it must be connected to the correct input.
• Low or defective battery. 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.
• An open input is continuously activated. Check the open loop or vehicle probe to make sure they are clear of objects. Verify connections
and operation for these devices.
• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if required.
• (Optional Accessory) Entry system output is connected to the OPEN input, and is "stuck" opening. Verify entry system connections and
operations.
• Obstruction blocking close photoelectric sensors, shadow loop, or safety loop. Check photoelectric sensor for alignment and verify all
connections and operation for safety devices.
• (Optional Accessory) Close safety edge is damaged or on an obstruction. Verify operation and connection of close edge.
• Verify that the Timer-to-Close is ON and adjusted to desired delay.
• Gate opened by a force obstruction reversal. Check the Diagnostic LED and clear gate path of any obstructions.
• The Interrupt loop or Shadow loop is obstructed (optional accessories).
• Obstructed close photoelectric sensor or safety edge (optional accessory). Check connections and operations of safety devices.
• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if necessary.
• An open input is continuously activated. Check the open loop or vehicle probe to make sure they are clear of objects. Verify connections
and operation for these devices.
• (Optional Accessory) Entry system output is connected to the OPEN input, and is "stuck" opening. Verify entry system connections and
operation.
• Operator in "Party" mode after RESET button pressed while at the OPEN limit. Use a remote control or the SBC to close the gate and
reopen it. Verify that the TIMER RUNNING LED is flashing.
• Double entrapment occurred. Two successive obstructions were encountered while moving the gate. Press the RESET button and ensure
that the gate path is clear of all obstructions. Check the FORCE setting to make sure it is properly set.
• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if required.
• Open and Close Limits are set too close together. If the Open and Close Limits are set within the ramp down distance of each other, the
gate will run at slow speed all the time.
• The gate is starting within the ramp down distance from the Open or Close Limit. Gate will run slow to limits if motion is started within
the ramp-down distance from the limit.
• Lock/Bipart Delay not set. Slide the Lock/Bipart Delay switch to ON. Verify that Gate 1 starts moving first on open and last on close.
• 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.
• Gate is unbalanced. Disconnect the arms and verify that both gates swing easily in both directions. If the gates are harder to move in
one direction verses the other, the gate is not properly balanced and the hinges must be adjusted.
• Bad motor connection. Check the motor wires and connections for possible loose or corroded terminals.
• Low battery. Measure the voltage across the battery. Voltage should be above 11.5 Vdc. Replace battery if required.
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