1, check valve problem Turn the cover clockwise. If the lid moves, there is no air pressure in the pot. If you can't open the pot, the cutting stop will not return, preventing you from opening the pot cover. You can find a hard object (such as chopsticks), press the check valve to return it to its original position, and then you can open the lid. There is still air pressure in the pot. If you rotate the lid clockwise, it may be that there is still air pressure in the pot and it must be cooled and released. Generally, it is natural cooling, air cooling and boosting. If you are not in a hurry to boil, you'd better use natural cooling to release the pressure. Generally speaking, there is no need to increase the pressure to release it unless absolutely necessary. 3. Too many attachments in the pot cover are caused by too many foreign objects attached in the pot cover. The residue in the pot cover should be cleaned in time and often to ensure that the pot cover is clean.