**Little Swan Washing Machine: Excessive Water Intake - Repair Theory Explanation**
The fault of excessive water intake is manifested when the washing machine stops filling water and begins washing, the water level inside the machine has already clearly exceeded the selected water level. The water intake level of the washing machine is controlled by the water level switch. Excessive water intake indicates that there is a fault with the water level switch and its associated water pressure transmission system. Although the water level switch still functions to control the water level, its control accuracy has deteriorated.
A slight air leak in the rubber diaphragm of the water level switch or in the water pressure transmission system, or blockage in the pressure hose (e.g., water droplets), can lead to excessive water intake in the washing machine. During water intake, when the water level reaches the specified height, the air pressure in the air chamber of the water level switch does not reach the specified pressure. Only by further raising the water level can the specified pressure be reached, resulting in excessive water intake.
An increase in the pre-compression amount of the pressure spring in the water level switch, or deformation of the moving spring plate causing changes in its performance, can also increase the switching resistance and result in excessive water intake in the washing machine. These faults are difficult to diagnose during repairs. On the washing machine, you can adjust the water level by turning the pressure adjustment screw. When adjusting, first loosen the pressure adjustment screw to lower the control water level, then add water to the washing machine until the selected water level is reached, and use a multimeter to check the on/off status of the normally open contact of the water level switch. Initially, the normally open contact of the water level switch is in an open state (the resistance measured by the multimeter is infinite). Then gradually tighten the pressure adjustment screw (turn the screw clockwise) until the resistance measured by the multimeter is 0Ω. At this point, the water level controlled by the water level switch is the normal water level. Then drain and refill the water for another inspection. The properly adjusted pressure adjustment screw should be marked with paint on the screw rod to fix its position.
For washing machines that have been used for many years, if the fault of excessive water intake occurs, it is also necessary to check whether the air chamber opening on the outer drum of the washing machine and the exhaust port connecting the air chamber to the pressure hose are severely blocked. If the air chamber is severely blocked, the outer drum needs to be thoroughly cleaned; for blockages at the exhaust port, simply clearing the blockage will suffice.
*Content source: http://blog.sina.com.cn/xtexiyji*