Fermax 3390 Intercom Connection Issue: Low Audio, Door Not Unlocking, Wiring & T Terminal

Hello,
I have a problem with the intercom, i.e. I can hardly hear or do not hear the person at the entrance door (she hears me very clearly) and the intercom does not open the door (after pressing the door opening button, you can hear the message "door open please close it behind you" and the sound of the electromagnet in the door, but the door does not unlock). Below I am sending a photo of the intercom after opening it and here I would like to ask if there is a need for a connection between the "-" wire and the T terminal as shown in the attached diagram?

I improved this cable but it has not improved

bk1991 wrote:

Hello,
I have a problem with the intercom, i.e. I can hardly hear or can't hear the person at the front door (she can hear me very clearly)

Report this problem to your administration / manager / cooperative.
The regulation is in the entry panel, to which regular user has no access. This is what the service does.

bk1991 wrote:

intercom does not open the door (after pressing the door opening button, you hear the message "door open please close it behind you" and the sound of the electromagnet in the door, but the door does not unlock).

As above - fault in the common part - maintenance service

bk1991 wrote:

I would like to ask if there is a need for a connection between the "-" wire and the T terminal as shown in the attached diagram?

No - it's called local bell, i.e. shorting the T and contact - will give a bell in the uniphone
(slightly different than when calling from a cassette).

greetings

@szpoak
This is a block of flats, my apartment is on the 2nd floor (No. 18). The cage has 5 floors, i.e. at least 50 premises. I measured the tensions between the veins:
blue - orange 18.17 V
orange - green 1.8 V
nievieska - green 18 V

@Ircys
Ok, I'll report to the administration, thanks.

Hi, I don't want to start a new topic so I'm plugging in.
My issue is with exactly the same intercom i.e. Fermex 3390.

New flat in a multi-family building, 7th floor, last floor - intercom and doorbell not working.
I do not know whether the intercom and doorbell worked before. This is not to be determined at this time and I do not wish to focus on this.

I'm in the flat tomorrow so I'll take photos of the instructions if they are to be of use. I have already familiarised myself with it, if anything.

I've taken the intercom apart and unfortunately there's absolutely no voltage there (unless there's some magic way to measure it?). Deafening silence.

.
The contacts are:
+
-
L
A
T

In the box at the entrance to the flat it looks like this:
.

I know you can't see much, but to my mind this is as it should be, according to the diagram:
.

I'm wondering if I should take these etons/connectors apart and check the voltages there, or just let it go for my part, as the subject goes beyond the flat area?

Any suggestions on what to do? What to diagnose? How to diagnose? Need to add something as part of the information?

Additionally:
1. a few days ago I was approached on the estate forum by another resident who also had a power outage on the intercom. Quite different cage and floor.
2: I checked the doorbell switch and there had clearly been some work done on it after painting etc., because there is a 5cm border around the switch with a different shade of paint and texture. It's just that someone painted it after some time or with a different roller.

Measure the voltage between + and - should be 18V (DC).
If it's not there, you don't do anything about it yourself but report it to the administration/manager.

I had already done the voltage measurement before entering the electrode.

Ok, in this situation I will report it further to look for the cause outside the flat.

Thank you for your reply.

Topic solved, someone working on the control panel led to a short circuit. As a result, there was no power at my place.