I discovered today at my rental house that the garage door safety sensors are not working. This is seemingly the opposite of the usual problem, in which an obstruction or misalignment of the sensors causes a door not to close. In this case, both sensors show a green light. If the door is closing and I block the sensor beam, the door still closes normally. The lights on the sensors do not change when I block the beam. This is an older opener, made in 1996, with a green programming button. I think the sensors worked correctly when tested as recently as four months ago. I'm wondering where the problem is and how to test things to see if a part needs to be replaced. I can think of a couple of possibilities. First, the logic board could have a problem that causes it to simply ignore the sensors. That seems weird, though, after all these years of normal operation. Second -- and I don't know if this is even possible -- one or both sensors could have a fault that tells them to report a continuous beam across the garage opening even when the path is blocked. But why? Has anyone even heard of this problem? There are zillions of articles on the internet about sensors preventing a door from closing, but I have found nothing about sensors not functioning.

We had a power failure recently that shorted out the garage door opener's circuit board. Nothing worked, no lights on. I figured out the problem from online research, bought a new circuit board and installed it today. It was relatively simple. Once I had finished and reconnected the power, the various LED lights all came on -- on the floor sensors by the garage door, on the wall control, and on the main unit. The LED on the main unit was solid red, not flashing. I had read that flashing meant something was wired wrong, so I felt this was a good sign. I followed the directions on programming which said step one was to set the door limits from the main unit. I followed those instructions, and the door operated fine, and both upper and lower limits were set. The lights were all making the correct flashes during this process. When both upper and lower limits were set, there was no longer any lit LED on the main unit, which I read is correct. Now, the next step after setting the upper/lower limits from the main unit is to go to the wall unit and close and open the garage door, which will automatically set the force and speed controls. There is no other way to complete this process. Well, the red LED light on the wall unit was list, but the buttons do nothing. The main button will not open or close the garage door. The light button will not turn the light on or off. The safe-lock button will not activate the safe-lock mode. It does nothing. But I know it is getting power from the red LED light. I have triple-checked the wiring, and it is all exactly as per instructions. I have nothing else to try. Note, I did read the wall mount will not work until the upper and lower limits are set from the main unit. I reset those limits three times, no help. It appears to me the limits are set so the wall unit should work, but it did occur to me that if somehow the main unit was forgetting the limits as soon as they were set, then that would cause the wall mount not to function, and so the problem could still be with the main unit. But from the LED light behavior, it appears the limits are setting correctly. Assuming the limits are set correctly, what can I do now to trouble shoot the wall mount not functioning correctly? Ken