Hi,

Have a 1/3 Chamberlain Liftmaster that started "ignoring" the DOWN limit switch. The garage door just kept on going down after it made electrical contact with the DOWN limit switch. (UP limit switch works fine - garage door stops when it makes contact).

Replaced logic board, the capacitor and the limit switch. And I STILL have the same issue.

Any ideas what to look for? At this point, there's not much to this garage door that I haven't replaced yet.

Thanks!