Why does the two-key switch work incorrectly?

Stanislav asks:

Such a problem. I drove into the apartment, the light in the bathroom did not light at all. The house is old, the wiring is all in the walls, so it is possible to work only with a distribution box. I decided to cope on my own, but I achieved the maximum that the light is now on in the bathroom, but only when the hallway is turned off. When I turn on the hallway, the bathroom immediately goes out. If you unscrew the light bulb in the hallway, then the phase does not come to the switch. The switch bought a new, simplest two-key.
Please help, otherwise this malfunction will drive me crazy !!!

To begin with, if you unscrew the light bulb and the phase does not come to the switch, and at the same time there is NOT ONE phase on the wires of the switch, then the switch breaks zero. Disassemble all the connections in the distribution box, take the long-wire dialer and ring all the lines, obviously you incorrectly connected the wires in it. And if you unscrew the light bulb in the BATHROOM, nothing disappears anywhere?

The answer to the question:

The phase to the switch should come constantly, and there should be zero on the wire from the lamp (it is especially easy to check if there is an incandescent lamp - just measure the voltage on the wires of the switches, it will be 220V). A phase should come to the switch, and two wires should leave, on which there should be phases when the switch is ON. The lamp should be ZERO directly.

It seems to you that the situation is as follows:
1. You connected zero in the bathroom to the lamp directly.
2. A zero was applied to the switch.
3. And the lamp in the hallway filed a phase directly.

I think that you connected the wires in the box so that zero goes directly to the bathroom, and the second wire from the light bulb in the bathroom is connected to the wire from the light bulb in the hallway, which goes AFTER the switch.

Does the light in the hallway light when you turn on the light in the bathroom? Well, at least to the floor, somehow? When the light bulb in the hallway you unscrew in the bathroom, the light continues to work?

And read this article https://my.electricianexp.com/en/elektricheskaya-sxema-podklyucheniya-dvuxklavishnogo-vyklyuchatelya.html. It describes how it should be.

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