1. There are obstructions above and around the water heater, or there is a lot of smoke and dust in the local air, and there is a lot of dust on the surface of the collector. Solution: Remove obstructions or reselect installation location. In areas with severe pollution, users should regularly wipe the heat collection tubes.
2. The water supply valve is not tightly closed, and the tap water (cold water) pushes out the hot water from the water tank, causing a decrease in water temperature. Solution: Repair or replace the water inlet valve.