I have three identical Garage Door openers. They are Liftmasters from ~1999 with Red buttons. On 2 of them I have GoControl GD00Z-4 installed and working perfectly for ~1 month. On the third door, I also have a GD00Z-4 and it is not working right. It will open the door just fine, but 9 times out of 10 it won’t close the door. The door starts to close, closes ~10% then reverses and the light on the Garage Door flashes ~6x. I can reproduce this reversal and flashing if I interrupt the photocell while the door is closing or if I push the hard-wired button quickly twice. The hard-wired button on the wall closes the door just fine and a standard wireless remote also works just fine, it is just the GD00Z-4. I initially thought it may have been the unit, so I returned it and today I installed a new GD00Z-4. Interestingly, the same thing is still happening on this door. The other 2 continue to work fine. I’m using @RBoy Device Handler.
Has anyone experienced anything like this or have any ideas how to troubleshoot further?