Chamberlain GA400D, GA420D Diagnostic Chart, FLASH, FLASHES, FLASHES, FLASHES, FLASHES, FLASHES, FLASHES, FLASHES, FLASHES, Power ON, Capacity, Low Battery, RPM Reversal Gate

Diagnostic Chart

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.

1	FLASH
		Normal Operation
Power ON
		Stop is not connected.
2	FLASHES
		• Press the RESET button and make sure the STOP LED turns on.
STOP not connected		• Check to make sure the jumper wire is connected between the COM and STOP input
		on the control board. Stop is a normally closed input.
		Battery voltage is below the recommended operating level.
3	FLASHES
		• Battery may not be properly charged. Disconnect all batteries and make sure AC
Low Battery Voltage
		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.
4	FLASHES	Battery voltage is below the recommended operating level.
Low Battery		• Battery may not be properly charged. Disconnect all batteries and make sure AC
		power or solar power is connected. Verify AC power outlet.
Capacity		• 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.
5	FLASHES	Gate 1 has encountered an obstruction or the arm is disconnected.
		• Make sure the path of the gate is clear and the gate moves freely.
RPM Reversal Gate 1
		• Incorrect or poor connection to Gate 1 arm. Check the green and white wires on the
or Arm Disconnected		motor arm to make sure connections are correct and secure.
		• Bad arm or control board. Press the LEARN LIMITS button and press the GATE 1
		buttons to move the arm. If the arm does not move continuously, disconnect arm from
		Gate 1 and connect the arm to the Gate 2 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.
6	FLASHES	Gate 1 has encountered an obstruction.
		• Make sure the path of the gate is clear and the gate moves freely.
Force Reversal Gate 1
		• 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.
7	FLASHES	Gate 2 has encountered an obstruction or the arm is disconnected.
RPM Reversal Gate 2		• Make sure the path of the gate is clear and the gate moves freely.
		• Incorrect or poor connection to Gate 2 arm. Check the green and white wires on the
or Arm Disconnected
		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.
8	FLASHES	Gate 2 has encountered an obstruction.
Force Reversal Gate 2		• 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.
9-11	FLASHES	Potential RAM, Flash, or EEPROM failure.
Potential chip failure		• Turn power off and on.
		• If problem does not resolve itself by turning power off and on, replace the control
		board.
		39	Operation and Maintenance