Testing continuity of the garage door opener

Thanks for the inputs Lane. I actually received another unit from them that I installed and it seemed to be working but now it too appears to be showing inconsistent information. I will do a bit of trouble shooting and see if I can find the issue. As you say, I'm getting a bit disappointed but before I get back to them, I want to make sure I did not mess up something on my side.

OK, I did a bunch of troubleshooting and can report back with some answers. You should be able to measure the resistance through the magnetic sensor by placing some small gauge wires into the sensor connector when it's disconnected from the main unit. The resistance should be ~1MOhm or greater with no magnet near, and nearly zero with a magnet next to it. In my case there was no change in any condition. It was consistently ~1MOhm. You can verify that the garage door opener is registering the sensor connection properly as well by shorting the sensor pins on the ESPHome opener directly. The door will register closed when the pins are shorted. I stole another magnetic sensor that was part of my houses old security system and replaced the garage door sensor with this one and solved my issues. I cut off the old sensor a few inches from the sensor and connected the new one by twisting each of the wires together and using small wire nuts so I could still use the length of existing wire and the sensor connector to the main unit. My opener is now registering properly. I'm sure Amazon has plenty of cheap options that will work just as well if Anthom can't assist. I hope this helps.

I'm having the same issue. Halfway through my workday the garage randomly changed to OPEN and after playing around with a few different magnets I could only get it to register CLOSED very intermittently. I had high hopes but after a single day I'm already quite disappointed with the product. Too bad.