Diagnostic Chart - Chamberlain LiftMaster LA412 Owner's Manual

TROUBLESHOOTING
Your gate operator is programmed with self-diagnostic capabilities. The diagnostic
LED will flash a number of times then pause signifying it has found a potential issue.
Consult Diagnostic Chart below.
CONTINUOUS FLASHES
(HEARTBEAT) POWER ON
2 FLASHES
STOP NOT
CONNECTED
3 FLASHES
LOW BATTERY VOLTAGE
4 FLASHES
LOW BATTERY CAPACITY
5 FLASHES
RPM REVERSAL GATE 1
OR IN MANUAL RELEASE
MODE. WIRING TO THE
OPERATOR IS
DISCONNECTED OR
DAMAGED
6 FLASHES
FORCE REVERSAL
GATE 1
7 FLASHES
RPM REVERSAL GATE 2
OR WIRING TO THE
ARM IS DISCONNECTED
OR DAMAGED
8 FLASHES
FORCE REVERSAL
GATE 2
9-11 FLASHES
POTENTIAL CHIP
FAILURE
» DIAGNOSTIC CHART
Operator is in sleep mode. Normal Operation.
Stop is not connected.
• Check to make sure the jumper wire is connected between the COM and STOP input on the control board. Stop is an
NC (normally closed) input.
Battery voltage is below the recommended operating level.
• Battery may not be properly charged. Disconnect all batteries and make sure AC power or solar power is connected.
Verify AC power outlet.
• Verify that the battery fuses are intact and not blown. Replace blown fuses with same type and rating.
• Batteries are no longer capable of holding a charge due to age or excessive depleting of the battery. Replace the
batteries (see accessories page). Dispose of old batteries properly.
Battery does not have the capacity to operate the gate operator.
• Battery may not be properly charged. Disconnect all batteries and make sure AC power or solar power is connected.
Verify AC power outlet.
• Verify that the battery fuses are intact and not blown. Replace blown fuses with same type and rating.
• Batteries are no longer capable of holding a charge due to age or excessive depleting of the battery. Replace the
batteries (see accessories page). Dispose of old batteries properly.
Gate 1 has encountered an obstruction or the wiring to the arm is disconnected, damaged or miswired.
• Make sure the path of the gate is clear and the gate moves freely.
• Incorrect or bad connection to Gate 1 arm. Check the green and white wires on the motor arm to make sure connections
are correct and secure.
• Bad arm or control board.
Gate 1 has encountered an obstruction.
• Make sure the path of the gate is clear and the gate moves freely.
• If there is no obstruction the force adjustment is set too low. Increase the force setting and verify that the gate moves
without reversing and will reverse if an obstruction is encountered.
Gate 2 has encountered an obstruction or the wiring to the arm is disconnected, damaged or miswired.
• Make sure the path of the gate is clear and the gate moves freely.
• Incorrect or bad connection to Gate 2 arm. Check the green and white wires on the motor arm to make sure connections
are correct and secure.
• Bad arm or control board. Press the LEARN LIMITS button and press the GATE 2 buttons to move the arm. If the arm
does not move continuously, disconnect arm from Gate 2 and connect the arm to the Gate 1 connector and repeat the
attempt to move the arm. If the arm does not move continuously on either Gate 1 or 2, replace the arm.
Gate 2 has encountered an obstruction.
• Make sure the path of the gate is clear and the gate moves freely.
• If there is no obstruction the force adjustment is set too low. Increase the force setting and verify that the gate moves
without reversing and will reverse if an obstruction is encountered.
Potential RAM, Flash, or EEPROM failure.
• Turn power off and on.
• If problem is not resolved by turning the power off and on, replace the control board.
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