How to Troubleshoot & Replace Whirlpool AP6015043 / WPW10110225 Water Inlet Flow Meter

I replaced the water Inlet flow meter and its been a week and error doesn't come up anymore. 

Checked H and C inlet screens and inlet valve solenoids. Screens were clean and both valves working.Checked water inlet flowmeter with a multimeter and didn't get a reading. Ordered a new flowmeter from AppliancePartsPros.com on Fri. the 5th, received it the morning of the 9th. Had the machine back together in 15 min. and running. Fantastic service.Thanks AppliancePartsPro. Sincerely Ken R 

REMOVED TOP OF WASHER AND HERE IS A TIP. FIRST THING TO DO IS TOUCH THE WATER VALVE CONTROL SOLENOIDS IF THEY ARE TOO HOT TO TOUCH REPLACE THE WATER VALVE ASSY. AND THE WATER INLET FLOW METER. THEY CAN FAIL DUE TO INTERNAL DEPOSITS OF LIME AND OR RUST. APPL. PARTS PROS WERE EXTREMLY HELPFULL AND I HAD THE PARTS THE NEXT DAY. THANKS AGAIN MIKE G. 

Replaced Flowmeter valve and blew out Pressure Switch and hose ...Fixed 

Replaced flow meter and control valve 

Replaced the water inlet valve as well as the pressure switch. While I was at it replaced flow meter and drain pump. Although the old drain pump was working OK the new one runs much quieter. So far, 4 loads washed and no codes! I believe the pressure switch did the job! 

I replaced the dual intake valves (probably the only thing needed) and I replaced the flow meter (on the outside chance that it was contributing to the problem) 

I ordered the switch, flow meter and hose. Replaced switch and hose in 30 minutes. Didn’t replace flow meter still good, original look sturdier then new one. While at it I cleaned the pump filter (in front bottom) and the reservoir connecting the hose. Both were dirty with gunk. The debris junk in the reservoir probably caused the switch to fail. Removed reservoir, has one screw and an o-ring attached to the main washer. After cleaning the reservoir I used a white lithium grease around the o-ring and the inlet to make a tight seal. Cleaned everything with a cloth and I used long q-tips to remove the gunk inside the reservoir. Also removed the liquid container for detergent and cleaned them. Took probably 1 hr to do all these knowing it's free of gunk and dirt that will not cause a failure in the future These vertical washers are easier for DIY jobs 

Replace flow meter by removing top of washer. Unplug machine and remove 3 screws at rear of top. Pull top back about an inch and lift off.. Find flow meter on left side near the top. Disconnect 2 clamps and unplug wiring harness. Reverse order to install.. Very east. 

Whirlpool Duet Washer error code F20 - Replaced Water Inlet Flowmeter part # AP6015043 from AppliancePartPros.com.Reasonable price and very fast shipping. Problem resolved!