LiftMaster LA412UL Installation Manual - Page 42

TROUBLESHOOTING SYMPTOM Gate opens, but will not close with transmitter or Timer-to-Close. Gate closes, but will not open. Exit loop activation does not cause gate to open. Interrupt loop does not cause gate to stop and reverse. Shadow loop does not keep gate at open limit. Obstruction in gate's path does not cause gate to stop and reverse. Photoelectric sensor does not stop or reverse gate. Edge Sensor does not stop or reverse gate. Alarm sounds for 5 minutes or alarm sounds with a command. Alarm beeps three times with a command. On dual-gate system, incorrect gate opens first or closes first. Alarm beeps when running. POSSIBLE CAUSES a. Open control active b. Vehicle loop detector active c. Fire Dept input active d. Timer-to-Close not set e. Close Entrapment Protection Device active a. Vehicle loop detector active b. Low battery with LOW BATT option set to CLOSE a. Exit vehicle detector setup incorrectly b. Defective Exit loop detector c. Low battery with LOW BATT option set to CLOSE a. Vehicle detector setup incorrectly b. Defective vehicle loop detector a. Vehicle detector setup incorrectly b. Defective vehicle loop detector a. Force adjustment needed a. Incorrect photoelectric sensor wiring b. Defective photoelectric sensor a. Incorrect edge sensor wiring b. Defective edge sensor a. Double entrapment occurred (two obstructions within a single activation) a. Low battery a. Incorrect Bipart switch setting a. Expansion board setting b. Constant pressure to open or close is given SOLUTIONS a. Check all Open inputs for an active input b. Check all vehicle detector inputs for an active detector c. Check AC power and AC Fail option setting d. Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 23.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries. e. Check Fire Dept input f. Check Timer-to-Close (TTC) setting g. Check all Entrapment Protection Device inputs for an active sensor a. Check all vehicle detector inputs for an active detector b. Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 23.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries. a. Review Exit loop detector settings. Adjust settings as needed. b. Replace defective Exit loop detector. c. Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 23.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries. a. Review Interrupt loop detector settings. Adjust settings as needed. b. Replace defective Interrupt loop detector. a. Review Shadow loop detector settings. Adjust settings as needed. b. Replace defective Shadow loop detector. a. Refer to the Adjustment section to conduct the obstruction test and perform the proper force adjustment that is needed. a. Check photoelectric sensor wiring. Retest that obstructing photoelectric sensor causes moving gate to stop, and may reverse direction. b. Replace defective photoelectric sensor. Retest that obstructing photoelectric sensor causes moving gate to stop, and may reverse direction. a. Check edge sensor wiring. Retest that activating edge sensor causes moving gate to stop and reverse direction. b. Replace defective edge sensor. Retest that activating edge sensor causes moving gate to stop and reverse direction. a. Check for cause of entrapment (obstruction) detection and correct. Press the reset button to shut off alarm and reset the operator. a. Check if AC power is available. If no AC power, then running on batteries and battery voltage must be 23.0 Vdc or higher. Charge batteries by AC or solar power or replace batteries a. Change setting of both operator's Bipart switch settings. One operator should have Bipart switch ON (operator that opens second) and the other operator should have Bipart switch OFF (operator that opens first). a. Pre-warning is set to "ON" b. Constant pressure to open or closed is given 42