If there is a buzzing sound, please follow these steps to troubleshoot:
1. Check if both ends of the water pipe are properly secured. Movement during transportation can loosen the water pipe, causing the pump to touch the bottom of the tank and produce abnormal sounds;
2. Inspect the pre-filter below the conduit. If the water quality is poor or there are many foreign objects, it can easily become clogged, increasing the pump's load and resulting in louder sounds. It is recommended to thoroughly clean and replace the water tray and reservoir weekly, and to change the filter and pre-filter monthly.