Before testing the water inlet valve, unplug the washer or shut off the power at the fuse box or breaker panel to avoid an electrical shock hazard.
The water inlet valve connects the hot and cold water lines from your home to the back of the washer. The solenoids on the valve open one or both valves to provide the proper water temperature for the wash cycle. If the valves are blocked or the solenoids do not activate, the symptoms may include no water, low water pressure, the wrong water temperature or water entering the tub even when the machine is off.
The water inlet valve can be identified by the water hoses connected to it at the back of the washer. Start by turning off the water supply at the valves on the wall. Disconnect both hoses from the back of the washer. Place the hoses into a bucket and turn them on to confirm that you are getting good water pressure and to clear out any debris from the line.
Inspect the filter screens on both the hoses and the inlet valve for debris build up. If you find any debris, clean it out. Use caution to avoid damaging the filter screens because the screens in the valve are not replaceable.
If debris was not present then proceed to the next step of testing the solenoids. Access to the valve may be easiest by opening the top or the back of the washer, depending upon make and model.