Electric pressure cooker display E4: pressure switch failure;

Solution: disassemble the pressure switch, cut a small strip of emery cloth (can not use too thick) placed on the pressure switch contacts back and forth to pull, to the upper and lower two contacts on the surface of the oxidized layer of sand can be clean (use a multimeter to measure is not a good contact, if the contact resistance is less than 1 ohm can be).

Electric pressure cooker fault code is basically the same, electric pressure cooker fault code description:

?E1: sensor circuit: 1. There may be a sensor circuit, including the lead, plug socket, etc.; 2. The weather is too cold, the sensor resistance is too high, resulting in the pressure cooker to display the code;

?E2: sensor short circuit;

?E3: Over-temperature: Commonly, the bottom of the pot is too dirty causing the temperature to be too high;

E4: Pressure switch malfunction.