Adi pot e4 is a bimetallic temperature control switch with poor contact at the bottom. The poor contact of the temperature control switch is caused by the blackening of the contact, the failure of resetting the thermostat or the welding disconnection of the thermostat circuit. You can disassemble the cooker at the pressure cooker site to check the thermostat, clean up the stolen goods on the contacts according to the specific situation, or replace the new temperature control switch.