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Because the faucet is connected to the switch of the water pump! That's why you need to turn on the faucet to start!
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The pump may be in the wrong position, or the water supply pipe in the toilet bowl may be too thin.
Check it carefully, it's that the inlet valve inside the toilet is not open! Check it one by one, and you'll know what's wrong!
If the connector is loose during the inspection, it will leak, and if the water storage tank is broken, replace it with a new one.
There is a water inlet pipe at the bottom of the toilet, and there must be a switch on the water inlet pipe that can be turned off or on, take a closer look. The general norm seems to be on the left side.
I guess your ball valve is broken, I don't know whether your question is asking about the induction type water tank or the ball valve type water storage tank for some basic water equipment, its principle is actually very simple, you can open the water storage tank to see which part of the problem, if there is a problem, you can repair it yourself, or find someone to repair it for you.
It is still recommended to use natural water storage.