1.If you want to make whistle sound more louder, please add the water above the outlet of the kettle.(Be careful not to overfill the outlet to avoid overflowing when the water boils)2.The whistle piece of the kettle is fixed under the cover. When you need to change it, please use a screw to unscrew the screw under the cover, then replace it with a new one and tighten the screw(We have an extra whistle piece in the package)If the kettle doesn't whistle when the water boils:1.Please check the lid is tightened or not? if the lid is not tightened, it will lead to water vapor leakage and will not whistle, so please pay attention to the three small clips on the edge of the lid are all pressed into the kettle2.The water in the kettle is enough or not? if the water is not enough the steam generated can not impact the sounding disc to make the sound too small or silent3. Please check the cover is blocked by food, tea stains, and other fine objects