The toilet makes a strange screaming sound when it is not in use

It may be the sound coming from the water pipe, it is more likely that it is the flush from the upper floor, and the sound is transmitted to your toilet through the water pipe, if the toilet itself is not leaking and flushing, it should not matter.

Uh-huh, there is the sound of water, pressure, air.

That is, the outlet of your toilet tank is not smooth or flat, and it seems that there is no need to change the toilet, you just need to buy the screws and other fasteners of the toilet lid can not be used to change the iron of the bureau, and the iron is too easy to rust. At least copper or plastic. Otherwise, it will affect.

There was once a novel about this thing, there is a noise Zheng can live in an imitation of the return to the building, it may be that the sound insulation of your floor is not good, upstairs or downstairs there is a toilet, so there is a sound when the toilet is not in use. There is also the possibility that loaches or catfish have run into the sewers, where they can survive for a long time.

The problem of the water outlet, when the toilet is not in use, only the water outlet has movement.

It could be a problem with the water pipes or the tank.