Re your answer Liftmaster garage door prob. mant thanks. Pls advise how to re-align sensors.
To Eric,Liftmaster model is 155LM
It took me a while because I was looking for the number you gave as the model # XXXXX I couldn't find that but I went back to the original question and saw that it was really a 1255LM.
Here is a youtube video that explains how to re-align your safety sensors. In it, the man refers to the lights on the sensors as being red and green. Your are green for the receiver and and amber for the sender.
I am working on sending you a copy of your owners manual but the servers are slow tonight:
Detailed instructions on how to align the safety sensors can be found on page 18. ..
I've been been doing things for my clients that others have said cant be done for over a 1/4 Century
Hi Kevin, Here is a link to your manual: