Pressure cooker does not press, what happened?
the top of the exhaust column has too many impurities, so that the pressure needle can not crush the air temperature column,
the inner rubber ring has split and leak, (Note: new pot top has exhaust, sealing two files, should pay attention to this item).
the pressure is too big or failure, before the pressure switch is not changed, has exceeded the normal pressure, automatic top pot is the top exhaust
The plastic shell of the top of the pan has split, and the press pin on the top of the pan does not believe in the air outlet;
