Pentium electric pressure cooker shows E4 means that the pressure switch is out of order. Check the solder joints in the power board and control electrode to see if there is any problem. Remember to disconnect the connecting wires at both ends when measuring the pressure switch.

The temperature control switch is in the middle of the heating plate (if you don't see the middle of the heating plate, just take the bottom cover apart, and at first glance, the middle one is the thermostat, and some manufacturers install the thermostat at the bottom of the pot).

According to the temperature change of the working environment, physical deformation occurs inside the switch, which produces some special effects and produces a series of automatic control elements with on or off actions, which are called temperature control switches, also known as temperature protectors or temperature controllers, or temperature controllers for short. Or the temperature is transmitted to the temperature controller through the temperature protector, and the temperature controller sends a switch command, so as to control the operation of the equipment to achieve the ideal temperature and energy-saving effect.