Check the wiring to the sensors and ensure that it is connected properly to the opener, and that there are no breaks or cuts in the wire, and that no staples have shorted the wires. After that, be sure the lenses of the sensors are free of dirt and debris, and they can clearly see each other. If the problem persists, replace your sensors.
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Check the wiring to the sensors and ensure that it is connected properly to the opener, and that there are no breaks or cuts in the wire, and that no staples have shorted the wires. After that, be sure the lenses of the sensors are free of dirt and debris, and they can clearly see each other. If the problem persists, replace your sensors.