1. It may be because the socket connection of the range hood is unstable and easy to short circuit, resulting in tripping phenomenon, which may be a sign of electric leakage. 2. It is also possible that the connected wires are worn, or the internal hardware of the range hood has failed. It is also possible that the range hood has been used for too long, resulting in the aging and damage of the hardware inside, or the quality of the range hood itself is not very good. Suggested treatment: 1. First, you can check whether there is any fault in the circuit. If the circuit is damaged, you can replace it with a new one, and then try to turn on the range hood again. You must do regular cleaning for the range hood in the future. 2. If there is nothing wrong with the wiring, then there is something wrong with the hardware inside. You can open the panel, and then use the electroscope to see the state of this range hood. It is best to find someone who knows electricity to check it. 3. If the range hood uses a thin fuse, it is better to replace it with a thicker fuse, and then check whether the restaurant is equipped with a leakage protector. If not, install one in time, so as to prevent leakage and make employees work more safely.