Could you please refer to the following steps to check the machine: 1. When the machine is turned on, please take out the water tank first. 2. Press the pulley switch inside the machine. Then the machine will automatically stop working, and the indicator light of the dehumidification button will light up in red. 3. If the machine can shut off, please make sure the silicone rubber drain stopper of the tank is plugged into the drain hole. 4. Please open the water tank cover and press the back of the float ball so that the float ball goes up and down easily.