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It should be a low battery or a malfunctioning solenoid valve.
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The smart system is broken.
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Check the water pipes.
The control valve in the tank is broken, or the zipper is off.
The toilet is clogged; Toilet blockage, generally there is a blockage at the toilet trap, the best and easiest way is:: >>>More
Generally, confirm that you have not fallen into the foreign body and go in a few more times to get through, and if you can't dredge it, you can find the property department to dredge it.
In your case, the floating raft cannot close the water inlet when it floats to the top - you need to remove the float, or unscrew the entire part on the left side, clean and debug. It really doesn't work, so it needs to be replaced.
Let's call a dedicated master.