Remove the front panel. Take the clear hose off the pressure dome.Run a small wire into the air pressure cup on the left side of the tub. Most likely gunk has built up and stopped air pressure from activating the water level switch.
While you have the hose off,blow into it and listen for the water level switch to click.
Reconnect the air hose. Set the machine to spin and turn it on. Then reset for normal wash and try again.