#2 JJ code appears?
JJ appears because the motor current is too large, which leads to the motor current too large, and the phenomenon of freezing cylinder appears. The reason for the freezer is that the left and right cylinders are not used at the same time. Need two to use at the same time, can not use one and another idle. If you really want to use only one cylinder, the other cylinder should also be put in the material, and then use it from time to time, can not be idle and not used.