The lid behind the toilet has the sound of water as soon as it is covered, and if it is not covered,

If you close the toilet lid and the water will flow, it may be that the toilet pumping system is broken, you can open the lid of the toilet pumping tank to check whether the pumping system is normal.

Look at the ejector rod in the button on the lid, how it has become longer and cannot be reset, which is equivalent to holding the button. FYI.

Sewers, through which everything in the toilet goes into the city sewers.

This is the toilet bowl with water fixtures stuck. You can adjust the water inlet (adjust the height of the float of the water inlet sanitary ware by hand to prevent it from being stuck by itself, and you can solve the problem by not moving up and down freely.) ）

Open the lid of the water tank and float up, this is a symptom but not a cure, it is recommended to take time to replace a new set of water parts, and the problem can be solved.