1. The heating time is too long, resulting in the heating wire being burned.
2. When the surface load increases, the surface temperature of the electric heating tube will also become high, resulting in the burning of the electric heating tube.
3. The insulation of the electric heating tube is damaged, the outer tube of the electric heating tube is damaged, the wire is damaged, the water contacts the heating tube terminal post, the power socket or jack is damaged, and the ground wire is not connected properly.
