Time with a stopwatch how long it takes to fill up on COLD ONLY, HOT ONLY, and WARM. On this machines if it does not fill in SIX MINUTES, it will drain and end the cycle.
I have seen this happen many times on service calls, and its always been the water inlet valve that was the problem if the water pressure to the machine is fine.
I'm attaching your tech. data sheet below.
8-1--->NO FILL, LONG FILL--->Fault is displayed when the water level does not change for a period of time OR water is present but main control does not detect the water level changing.
Is water supply connected and turned on?
Low water pressure; fill times longer than six minutes.
Are hose screens plugged?
Check for proper drain hose installation. Is water siphoning out of the drain hose? • Drain hose must not be more than 4.5" (114 mm) into the drain pipe.
Check pressure hose connection from tub to pressure sensor. Is hose pinched, kinked, plugged, or leaking air?
See TEST #2: Valves, page 13
Here's the water inlet valve for your model:
Water Inlet Valve W11210459
Here's the video to replace it, if you need to:
This video provides step-by-step repair instructions for replacing the water inlet valve on a Whirlpool washer. Learn more from the experts at Repair Clinic.