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Whirlpool uses a flow meter that detects the flow of water entering the washer. If this flow meter does not detect the correct amount of water entering the washer it will sound the F20 error code. Often this repair can be made with out calling an appliance repairman and without ordering parts. Start by removing the washer fill hoses; both the cold and the hot water hoses. Check for proper water pressure from the house. To do so, turn the water on and put the hose inside the washer or a bucket.
If water pressure is good, check the water valve inlet screens. Most residential washing machines have inlet screens. The screens prevent minerals from clogging the solenoid. With the hoses removed, you can visually inspect the water inlet screens. If the water valve screens are clear the inlet valve with the screens itself will need to be replaced. To replace the water valve, remove the top of the washing machine. Three screws hold the top down. The screws that hold the top down are on the back of the top panel. Once removed the top will slide back and off. Now remove the wire harness that connects to the valve. One screw holds the valve to the washers cabinet. Removing the screw and sliding the valve over will release the valve from the back panel enabling you to complete your repair.
to clean those screens
turn off water supply to washer
pull it away from the wall about 2 feet
remove hoses from back of washer and be sure to note where the hot and cold goes
use a small flatblade screwdriver and pop out screen inside of where hoses attatch at back of washer
if cleaning does not work the part (water inlet valve) the screens are inside of will need to be replaced
this video will show you how to replace that valve
When you had the water lines off the unit did you check the filter screens where the hoses screw on? .Their are screens in the washer inlets to keep crud out the washer.These screens can be carefully removed cleaned and reinstalled .The cold side is always the one to cause the problem because the hot side most of the crud has settled in the hot water heater If for some reason that did not fix your problem you will need to replace the inlet valve solenoidassy. Hope this Helps GOOD LUCK
look into the inlet valves of the washing machine(where the hose connects to) and see if you can see inlet screens in the inlets, they are removable and you can can clean them but be very careful popping them out as they can get bent easily, hopefully that does it
If your machine is a FAV6800AWW or FAV9800AWW the (upside down u and f) may be a “NF” for no fill error.The washer has tried to fill the machine with water and has sensed a water fill issue.The control board has shut the wash cycle down with an “NF” error to the display because of excess time to complete the water fill portion of the wash cycle. Will the machine complete the cycle with Hot water only or Cold water only?I would do a Quick Wash cycle just to test with an empty wash basket. Regardless of the above test and assuming you have good water pressure for both Hot and Cold supplies to the washer I would do the following. Close the water source valves to the washer and remove the Hot and Cold hose connections at the back of the machine and check for clogged inlet screens.If the water inlet screens are free of restrictions I would go into Service Mode and turn on the Hot and Cold water valves on one at a time and make sure the tub will fill with about 2 inches of water in about 3 minutes in service mode.Check both Hot and Cold inlet valves individually see page 16 of the SM Board Output Test, enter service mode and do the function test for both Hot and Cold Water Valve’s.If the inlet screens are clean and you have water fill restrictions in service mode we may need to look at replacing the water inlet valve assembly.You can turn on the drain pump in service mode to empty the tub or just start a wash cycle and the machine will empty the tub. The Service Manual for reference. Sears Parts Direct for reference.
washing machines allow cold water to enter only during certain cycles.
Others intermittently allow hot and cold to enter, to temper the
temperature of the water. Consult your owner's manual if you are unsure
about whether the machine is acting abnormally.
If you're sure the machine is not working the way it used to--or should--check the following.
Is the cold water turned on? If not, turn it on.
Is the washer getting hot water but no cold water? If so, check to see if the control panel settings are correct.
there cold water coming through the proper hose? If not, check to see
if the screen inside the water-inlet valve is clean. (The water-inlet
valve is the device on the washing machine that the fill hoses are
attached to.) If it's clean, you probably have a defective water-inlet
valve. If so, you need to replace the valve.
check to make sure you have both the hot and cold water lines connected and the water is turned on. sometimes the hot or cold line will clog up and it will not fill up during the rinse cycle.
the humming sound may be the water valve coming on but no water is coming thru.
if you have a warm rinse set it to that to see if this is the problem.
you can clean the screens on the water valve by taking the water inlet hoses off the machine and you can look at the screens onside.
if not it may be a timer problem.
Most washers have a small screen at the water inlet valve. They can be accessed simply by revoving the hose from the back side of the washer, using a small screw driver you can carefully remove the screens and clean them out under a faucet.That may be all that is wrong.