1. Check whether the filter screen of the inlet valve is blocked and whether the inlet valve is damaged. After confirming that they are in good condition, measure the voltage of 220V at both ends of the solenoid valve with a multimeter AC voltage block, which proves that the fault lies in the solenoid valve itself. 2. Measure the coil resistance of solenoid valve with electric hoist. The normal value should be 4.5~5. 1kQ, and the measured resistance value is infinite, indicating that the coil of solenoid valve inlet valve is burnt out. Replace the inlet valve and troubleshoot. If the water does not stop. The water inlet of the washing machine has reached the rated water level, and the water inlet solenoid valve still does not stop the water inlet. This situation is generally that the water level pressure switch is damaged, which can be judged by blowing pressure method.

3. Disconnect the power supply, remove the water level switch, blow air to the pressure switch through the air return pipe, and measure the resistance between the two lugs of the water level switch with a multimeter. When blowing, the resistance should tend to zero, and when not blowing, the resistance should be greater than 10kQ. After inspection, the resistance value measured by this machine is always very large, and the action sound of the contact in the water level switch can not be heard, indicating that the water level pressure switch is faulty. Replace the water level pressure switch.