Just installed a new Chamberlain HD420EVP but cannot get my linear to open or close the garage door.
Assuming the linear is setup through ST correctly…
First off, make sure the wires are in the correct place. My garage door opener had a couple different spots to hook into and one did not work. (They also weren’t labeled)
Second, does the new garage door have a fancy new button too? I saw a few people that had issues with the wall buttons that displayed the time or had some kind of different options. They ended up having to replace those with a basic wall button.
Pictures of the setup may help me and others help you as well.