Garage Door only Closing when Keeping Button Pressed

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  • Updated 2 months ago
In the past I could just click on the button on the wall unit and the garage door opened/closed. However, suddenly it just opens but when trying to close the door with a short click it would attempt to close but then immediately reverses direction and opens. The only way I can close the door now is by keep pressing the button until the garage door is completely closed.
It crossed my mind that maybe I bumped the sensor when I was rearranging stuff in the garage. However, one side of the sensor always has the orange LED on and the other side has the green LED light on unless I interrupt it by moving my hand in between the sensors. So what could be the reason that the garage door does not close anymore with a single click on the wall button?
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Pm

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Posted 2 months ago

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Willard Volquardsen

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You didn't mention what brand and model garage door opener you have, but it sounds to me like you've already diagnosed your problem:  the safety sensors are not aligned correctly.  Try adjusting the one with the orange LED until it turns green and I bet your garage door will close again with one push of the button.  That's the way my Chamberlain C610C garage door opener works -- both sensor LEDs are green when they are properly aligned.
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Pm

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I have the Liftmaster 8500. I tried to adjust the safety sensor with the orange light but didn't get it to turn green. I actually didn't try this before figuring that if one sensor can see the one on the other side then the other also must be able to see his counterpart. Anyways, what else could cause this and does the light indeed have to be green (on the other side it's either green or off but no orange).
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Pm

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So I found the manual online. I first got the wrong one (8500W) which is different than the 8500. So the sender needs to have a solid orange/amber light while the receiver needs to have a solid green light when not interrupted. Next to the up/down keys on the motor there is a LED that was blinking 4 times in a row. According to the manual that pointed to a misaligned sensor but the green light was neither dim nor did it blink. In any case, I did clean the opening on both the receiver and sender and wiggled the receiver. When moving it, it would first start blinking and then go completely out. Anyways, after some trial the blinking LED on the motor would stop (it repeated the 4 blinks every 20 seconds or so). And voila, now the door closes again with a single button press. 
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Willard Volquardsen

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I'm glad you were able to figure it out.  I found the same 8500W manual online and was about to read up on your issue when I saw your update that you had solved it.
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Pm

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Thanks for the effort. I appreciate it!