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TROUBLESHOOTING
If the emitter sensor and receiver sensor indicator lights do not glow steadily after installation, check for:
• Photoelectric sensor alignment
• Obstruction
• Power to the operator
• A short or broken wire
• Incorrect wiring between photoelectric sensors and the operator
If the receiver sensor indicator light is off or fl ashing (and the invisible light beam path is not obstructed), check alignment of the
sensors and/or for an open wire to the receiver sensor.
If the emitter sensor and receiver sensor indicator lights are both glowing steadily but interrupting the photoelectric sensors does
not cause the door/gate to reverse when closing, check both sensors to make sure one sensor is the emitter and the other is a
receiver sensor as indicated on the sensor housing.
NOTES:
• Direct sunlight to the receiver sensor may prevent the operator from closing even when both the emitter and receiver indicator lights
are illuminated. Swapping the position of the emitter and receiver sensors will resolve this issue.
• To avoid nuisance blockages from snow, install a hood over the photoelectric sensors to keep the snow from obstructing the lenses.
• Professional service is required if the operator closes the door/gate when the photoelectric sensors are obstructed.
• 2016 UL 325 gate operators have diagnostic codes related to entrapment protection devices. Refer to your gate operator manual or
wiring diagram for a list of troubleshooting diagnostic codes.
FOR SERVICE OR TO ORDER REPAIR PARTS DIAL:
1-800-528-2806
LiftMaster.com
WARRANTY
LiftMaster
®
warrants to the fi rst consumer purchaser of this product that it is free from defect in materials and/or workmanship for a
period of 1 year from the date of purchase.
TEST
1. Connect power to the operator.
2. Align the photoelectric sensors so the green LED on the emitter sensor and the yellow LED on the receiver sensor glow steadily.
3. Press the OPEN button to fully open the door/gate.
4. Press the CLOSE button to close the door/gate.
5. For doors: Obstruct the light beam while the door is closing. The door should stop and reverse.
For gates: Obstruct the light beam while the gate is opening or closing. If closing, the gate should stop and reverse to the full open
position. If opening, the gate should reverse for 4 seconds then stop.
The operator will not close if the indicator light in either sensor is not glowing steadily, alerting you to the fact that the sensor is
misaligned or obstructed.
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