I'm writing on behalf of a friend who has a whirlpool 4.7-cu ft high efficiency agitator top load washer model #WTW5105HW She has had this message pop up 3 or 4 times. Washer is 2 years old and just started this, so we know the connectors are correct. Nothing has been changed or moved. Please advise

If you friend keeps getting the F4E0 errror on that model which is a Whirlpool Cabrio washer, then the thermistor that is built into the water inlet valve is bad, so the water inlet valve willl need to be replaced.  The part number for that valve is W11614515.