Turn the water supply knob to the on position if it is turned off. Open it fully to prevent the machine from running out of water during the wash cycle.
Check the supply hoses going from the water supply valve to the machine for any kinks. Remove any twists.
Turn off the water going to the machine and unplug the washer from the wall. Unhook the water supply tubes from the back of the machine using a wrench and place them in a bucket. Turn on the water supply to see if there is a good water flow. Remove the filters from the end of the hose and rinse them if they are clogged.
Unplug the machine if it is plugged in. Remove the two screws at the ends of the control panel. Slide a putty knife under each side of the panel to unlock it and lift up. Locate the water level switch or load size switch. Pull off the connectors from the switch using a pair of pliers. This exposes three terminals. Turn on your multitester, a small device that measures electrical current, to the X1 position and put the probes on two of the connection terminals at a time. Test 1 and 2, 1 and 3 and 2 and 3. You should receive a zero or infinity sign. If not, remove the switch and replace it.