I tried two things. First, I unplugged and slightly unscrewed ( just little loosen up) the two screws on the inner lower wall of main body and screwed backslightly sanded the gray rust on the screw. And screwed back tightly. Second, I opened the bottom two screws and open the plastic cover and unscrew the two electic rod with blue lines and red lines attached on each touching the gray metal plate and shined/sand off the surface of the gray metal plate so the connection is back. And screwed back the electronic rods back. My problem was the E5 error code is coming up when the pressure mode is on and also the saute mode is on. The status was all the way up when I start the pot. And short time later E5 beeping coming up. Now after the two things done the status is back to no light when the start button pressed. Just it finished the pressure cooking. 😀 I do not know which process fixed it. Maybe the first part is enough just rusted screws to block the proper contact to measure temperature.