The washer goes through the wash cycle then starts to rinse fills up half way with water and keeps filling with water but only half full.
Based on the description, this sounds like the unit is siphoning the water as it fills. You will want to check to make sure that the drain hose is not pushed too far down into the standpipe as this will be the most likely cause for the issue.
How d o you remove the water level switch?
To remove the water level switch you will remove the screw on either side of the control panel on the back. Pull the knob off and roll the control panel forward and up. Twist the old switch off and install the new one.
If the water level switch is faulty. will it make the washer unbalanced?
Answer Dee, To a slight degree it is possible. but not likely, that the water level could be high enough to cause the articles to tumble and "bunch up", and cause unbalanced loads. You need to check the more obvious and common issues, level the washer and lock the legs, check the shock absorbers and tub springs, proper loading, etc.