LiftMaster HCT HCT501130 Manual - Page 29

TROUBLESHOOTING TABLE Condition Overload LED ON and Power LED ON Overload LED On and Power LED On System On LED Flashing Possible Causes Solution 1. Short circuit at terminals 11 and 13. 2. Short circuit at any of the loop detector in the board. 3. Short circuit in the control board. 4. Voltage is over 138 Vac. 1. Remove the short circuit condition at the terminals. 2. Remove the defective loop detector. 3. Reduce the accessories load from surge suppressor terminal 13. 4. Verify your electrical power. 1. Excessive current draw at terminal 13. 2. Over-voltage at the 120 Vac line input. 1. Remove the short circuit condition at the terminals. 2. Remove the defective loop detector. 3. Reduce the accessories load from surge suppressor terminal 13. 4. Verify your electrical power. 1. One limit switch is faulty (Rapid Flashing). 1. Test the limit switches and wire connections, 2. Motor thermal fuse has popped-out fix the fault. (Slowly Flashing). 2. Reset the motor. 1. Gate/door has encountered an obstruction 1. Remove the obstruction. Reverse Sensor LED On during traveling. 2. Turn the reverse sensor switch counter 2. Reverse sensor is extra sensitive. clockwise a little more and try again. Alarm Sensor LED On 1. Gate/door 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 Continuously 1. There is a continuous open and/or close command present. 1. This is a normal response of the gate/door 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/door open. 1. This is a normal response of the gate/door operator. It does not represent necessarily that there is a problem. Check inputs for command. Timer LED Blinking, Command Processed LED 1. Gate/door has reopened because it Blinking and Reverse encountered an obstruction while closing. Sensor LED On 1. Any re-new command will resume normal operation. Check for obstructions. Audio Alarm On 1. Gate/door 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 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. For Toll Free Technical Support: 1-800-528-2806 1. Reset the loop detector (If you use 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. 27