Intercom Bitron AV1407/010 stuck on open

[PierreMacherel]

Hello,
Thanks for this project!

I could use some help: I have a Bitron AV1407-010 Universal T-Line Intercom Handset Data Sheet.pdf.

I wired it like this:

from the manual:

From left to right of ESPBell-LITE

ESPBell-LITE	intercom
LOCK (black)	6 (system ground)
LOCK (red)	OP (To be connected to the door phone terminal pin 6) disconnected in picture (see below)
...	not connected
BELL (green)	6 (system ground)
BELL (yellow)	APP (call tone by buzzer or electronic)
VCC (black)	V (of a usb cable)
GND (red)	G (of a usb cable)

Warning

But I have a problem: with this wiring the door is physically kept unlocked (regardless of the ESPBell-LITE being powered or not). I have to disconnect the LOCK (red) --> OP to lock it.

Otherwise, the ESPBell-LITE is detected by home assistant, the bell is correctly detected.

[PricelessToolkit]

Hi, LOCK (black) and LOCK (red) are the same contacts "one side of the relay"

So, connect 6 (system ground) to "LOCK (black) and LOCK (red)" and the next two wires "gray and brown" to "OP Door Opener"