The reasons are as follows
 The upper coupler is faulty, and the internal contact is poor.
 The upper coupler is faulty, and the internal metal sheet becomes elastic.
 The upper coupler is in poor contact with the lower coupler.
 The steam switch is faulty, and the internal metal spring changes.
 The contact of the steam switch is in poor contact.
 The power cord or plug has poor contact.
 The power supply board is in poor contact. After the switch is used for a long time, the contact point between the movable part and the fixed part of the switch is worn.
 What's wrong with the electric kettle jumping when the temperature is less than 100
 1. It may be the air pressure. If the air pressure is low, the boiling point of water will be low, so the water will trip if it does not reach 100 degrees.
 2. It may also be that the bimetallic strip of the steam temperature sensing element has a problem, which causes the tripping in advance.