Chamberlain garage door opener problem
I just recently purchased a home with a Chamberlain garage door opener, Model 4200, manufactured in 1999. Today the garage door was acting strange, opening and then shutting off. It did this on the way down as well.
As I fiddled more with it, I noticed that as the garage door opener is functioning, the opener vibrates and the power shuts down. I checked the connections to the outlet, and everything seems fine. However, when I push up from the bottom of the opener, the power shuts on and off. It defintely seems like something is loose or defective, but I'm too much of a novice to know what that is. Again, to sum up, as the garage door opens or closes, the power is interrupted, causing the door to simply stop. Any suggestions as to what is going on would be very much appreciated. Thanks.