Have you tried it? This was my understanding as well. You just have to change the is_slave_controller field to “true” in template.yaml before flashing the firmware. Also, the 3 wires must be shared with the other thermostat.
I haven’t tried it yet, but I will confirm once I get the ESP32 devkit.
I had to order extra tiny PCBs as well. I am shipping from Spain to anywhere in the EU for 12€ plus shipping. PM me if you are interested.
I did try it and it seemed to work fine. I switched fairly quickly to using it as my primary controller to see what was different.
Of note:
I did not get in/out/mid temperatures until I made my esphome the primary
The fan speed configuration went away after I made it primary
I think the LG controller as primary made the system stick to the schedule I had programmed (I would use the esphome to switch modes and it would sometimes ‘pop’ back to what was scheduled… I didn’t debug this much, I could be mistaken what was going on.
I have 3 spare PCBs left. They where manufactured without C1 and without the 2 pin sockets as these were out of stock. I’ve purchased the C1 separately and soldered it to the PCBs after receiving them.
The 2 sockets will have to be ordered separately and soldered to the PCB, but that’s not difficult.
I’m living in Germany.
Let’s say I need to install this as slave (my “indoor” unit is actually outside and it sends the air inside via ducts so I need to be able to use the PREMBT temp sensor). Do I just splice the cables that go to the PREMBT and install this in parallel?
Hello! I miss the Airflow up/down setting from 0-6 for up to 4 vanes entities!
What’s your indoor unit model? Some (older?) units unfortunately don’t let a wired controller change the vane setting and the ESPHome controller then hides the setting from Home Assistant. There’s some discussion on a previous report here: