Chamberlain CSW200UL8, Owner'S Manual, Page: 45 / 52

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TROUBLESHOOTING
TROUBLESHOOTING CHART
Condition Probable Causes Solution
Overload LED ON and Power
LED OFF
1. Short circuit at terminals 11 and 13.
2. Short circuit at any of the loop detectors in
the board.
3. Short circuit in the control board.
1. Remove the short circuit condition at the
terminals.
2. Remove the defective loop detector.
3. Send the board to repair.
Overload LED ON and Power
LED ON
1. Excessive current draw at terminal 13.
2. Over-voltage at the 120 Vac line input. 1. Reduce the accessories load from surge
suppressor terminal 13.
2. Verify your electrical power.
System On LED Flashing
1. Motor thermal fuse has popped-out
(Rapid Flashing).
OR
2. One limit switch is faulty (Rapid Flashing).
1. Reset the motor.
OR
2. Test the limit switches and wire connections, fix
the fault.
Reverse Sensor LED ON 1. Gate has encountered an obstruction during
traveling.
2. Reverse sensor is extra sensitive.
1. Remove the obstruction.
2. Turn the reverse sensor switch
counter-clockwise a little more and try again.
Alarm Sensor LED ON 1. Gate encountered an obstruction during
traveling.
2. Alarm sensor is extra sensitive.
1. Remove the obstruction.
2. Turn the alarm sensor switch counter clockwise
a little more and try again.
Command Processed LED
ON
1. There is a command hold active. 1. This is a normal response of the gate operator. It
does not represent necessarily that there is a
problem.
Timer LED Blinking and
Command Processed LED
Blinking
1. There is a command holding the gate open. 1. This is a normal response of the gate operator. It
does not represent necessarily that there is a
problem. Check inputs for command.
Timer LED Blinking,
Command Processed LED
Blinking and Reverse
Sensor LED ON
1. Gate has reopened because it encountered an
obstruction while closing.
1. Any re-new command will resume normal
operation. Check for obstructions.
Audio Alarm ON 1. Gate has encountered two consecutive
obstructions while trying to close or open.
1. Any re-new command will resume normal
operation but not a radio command. Check for
obstructions.
2. You can stop the alarm by using the built-in
reset button.
3. You can stop the alarm by using an optional
stop button.
Any Loop LED ON and No
vehicle on the sensing area
1. The loop detector needs to be reset.
2. The wire loop has been disrupted.
3. The loop detector needs to work in a different
frequency.
4. The loop detector is too sensitive.
1. Reset the loop detector (If you use LiftMaster
Plug-in Loop detectors, change the setting for
sensitivity and come back to your original
setting).
2. Verify and correct connections.
3. Set a different working frequency.
4. Decrease the sensitivity of the loop detector.