The water intake of Siemens washing machines must exceed the set water level by a significant amount before it stops filling.
Analysis and Maintenance: This phenomenon indicates that when the actual water level has already reached the specified height, the air pressure in the gas chamber of the water pressure switch is still not up to the specified value. The water level has to rise further before the water pressure switch will actuate. Specific reasons and repair methods are as follows:
1. Blockage or leakage at the air guide nozzle of the water pressure switch's gas chamber. Clearing debris from the air guide nozzle or sealing the leaking area with 401 glue should resolve this issue. If the air guide hose is aged, twisted, or cracked due to leaks, then the air guide hose needs to be replaced.
2. Excessive pre-compression of the water level control spring in the water pressure switch. Adjusting the regulating screw outwards slightly to reduce the pre-compression of the water level control spring will solve this problem.
3. Deformation or damage to the reversing plunger and transmission components inside the water pressure switch. This can be resolved through repair and calibration. In severe cases, the water pressure switch will need to be replaced.
Article Source: http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3432932.