Kind, by the microprocessor IC1 14021WFCS (CPU) control machine work, the normal timing control power circuit outputs 6V, 3.2V, 4V DC voltage to the three-way of IC1 {26} feet, {25} feet, { 19} feet (see local circuit shown in the drawings). Any way abnormal voltage can cause the appliance is not normal. Measured with a multimeter {26} {25} {19} pin voltage is normal; Cha {27} {28} feet (pick crystal) voltage of 4.5V normal; {3} pin voltage 3.95V normal, indicating that the micro- the processor is working properly. {3} pin voltage applied to the transistor through a resistor R1 V4 b pole, V4 conduction, thereby VS4 is triggered conduction, inlet valve pull, automatic water inlet valve opens when the water level to the set and tested When the device detects the water level signal to IC1, IC1 to make a washing machine motor rotation command into the washing state. V4 has been measured transistor conduction while the inlet valve is not operating, suspect triac tube VS4 damage. After the trial wire shorted triac tube is energized, inlet valve pull showed triac tube VS4 indeed damaged. Use the same model to replace the triac tube after washing back to normal.3Chservice manual download site