1. Clean the filter screen: If the filter screen of the range hood is blocked by oil, it will lead to insufficient suction. You can take out the filter and clean it, or replace it with a new one.
2. Check the power supply: If the range hood has no power supply, you can check whether the plug and socket are connected normally or whether the fuse is blown.
3. Check the switch: If the switch of the range hood is damaged, you can replace it with a new switch.
4. Check the motor: If the motor of the range hood is damaged, it can be replaced with a new one.
5. Check the air duct: If the air duct of the range hood is blocked, you can clean the air duct or replace it with a new one.
If the above methods can't repair the range hood, it is recommended to contact professional maintenance personnel for maintenance.