I’ve got the same chamberlain opener (same wiring). I was not able to get the door to open with the unit. I talked to Dennis and he had a test to make sure the wiring to the opener is working correctly. If you remove the cable from the garadget unit and short the two wires together with the screw driver for a quick second, that will simulate the relay inside the unit. I tried this on my opener and it wouldn’t open. I’m going to have to do some more research on this opener tomorrow and see what we need to do to make it work. I’ll keep you posted on what I find.