The failure of the solenoid valve will directly affect the action of the switching valve and the regulating valve. When dealing with the failure of the solenoid valve of the switching system, an appropriate time should be selected, and the solenoid valve should be dealt with when the power is lost. If the processing cannot be completed within a switching interval, the switching system can be suspended and processed calmly. Troubleshooting method for solenoid valve not working Common faults include solenoid valve not working, which should be checked from the following aspects: (1) Air leakage. Air leakage will cause insufficient air pressure, making it difficult to open and close the forced valve, due to the damage of the sealing gasket or the wear of the spool valve, causing blow-by in several cavities. (2) The solenoid valve wiring head is loose or the wire head falls off, the solenoid valve should not be energized, and the wire head can be tightened. (3) The solenoid valve is stuck. The matching gap between the spool valve sleeve and the valve core of the solenoid valve is very small (less than 0.008mm), and it is generally assembled in a single piece. When mechanical impurities are brought in or there is too little lubricating oil, it is easy to get stuck. The treatment method can be used to poke the wire through the small hole in the head to make it spring back. The fundamental solution is to remove the solenoid valve, take out the valve core and the valve core sleeve, and clean it with CCI4, so that the valve core can move flexibly in the valve sleeve. When disassembling, pay attention to the assembly order of each component and the external wiring position, so as to reassemble and connect correctly, and also check whether the oil spray hole of the lubricator is blocked and whether the lubricating oil is sufficient. (4) The solenoid valve coil is burned out. The wiring of the solenoid valve can be removed and measured with a multimeter. If the circuit is open, the solenoid valve coil is burned out. The reason is that the coil is damp, causing poor insulation and magnetic leakage, resulting in excessive current in the coil and burning, so it is necessary to prevent rainwater from entering the solenoid valve. In addition, the spring is too hard, the reaction force is too large, the number of coil turns is too small, and the suction force is not enough, which can also cause the coil to burn out. In emergency treatment, the manual button on the coil can be turned from the '0' position in normal operation to the '1' position to make the valve open.