😃 Tip 4) Are the sensors blocked?

In newer openers, safety sensors may also be the culprit. Safety sensors work in pairs, mounted on either side of the garage door at about 10 to 12 inches in height. Each beams a light – one red, one green – across the opening. When the beam is obstructed or when the sensors cannot catch the other sensor’s light, the garage door opener will fail to engage or, sometimes, stop during operation. The fix is simple: Check for anything obstructing the sensors. Remove obstacles, position the sensors directly across from each other, or clean the sensor’s surface to remove moisture, dirt or other impediments. Afterwards, attempt to open the garage door again. If you’re successful, you know that the problem is resolved.