Either you have a faulty water valve, which would either need to be fixed or cleaned, or you have constant power to the valve caused by a problem in the controller which does not allow the cycle to advance. If, as you say, it does not overfill, then apparently your water level control pressure switch is operating and causing the pump to turn on and drain as fast as it fills.
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FL error indicates flood condition and is caused
due to any overfill condition that occurs inside the washer. To clear the
display you can press and hold the STOP/CANCEL button. Usually this error is
caused when overfill switch trips due to excessive water in the tub. You can
also try to clean the drain hose and check the water inlet valve. Please get
back to me if you have any other questions.
"FL" flashes if any overfill condition occurs. This condition occurs when
excessive water in the tub causes the overfill switch to trip. The control
must realize that the trip was due to an overfill condition instead of a
suds lock condition in order for "FL" to be displayed.
With an overfill condition, the beeper repeats a warning every 10 seconds
with no time out. The pump is cycled in drain mode for 30 seconds on, 30
seconds off until the overfill switch resets or power is discontinued to
the unit. Press STOP/CANCEL to clear the display.
The water level is controlled by the pressure switch. It will be located behind the load level selector knob inside the operator console. The way MOST pressure switches are designed, they will have an electrical connector plug and a rubber hose attached. Unplug the washer and remove the back panel of the console and verify if the plastic air hose is still attached to the switch. It is common for this hose to fall off over time due to vibration or develop cracks. If the hose is not attached, the pressure switch will not detect the change in pressure from the wash tub as it fills and the water will not shut off. The tub will continue to fill until it overflows. The same is true if you have a bad electrical connection. Remove the connector and check the terminals to make sure they are clean. If any of these preliminary checks do not work, replace the pressure switch. If your washer is not configured this way, please post back with your model number so I can attempt to verify. I hope this helps you.
If when you press pause while filling and it keeps filling then you have a faulty valve. If the filling stops then valve is ok. If you filling keeps going until overfilling the machine which is what i understand is your problem, then most likely that you have a small pinhole in your pressure tube.
If the washing machine operates and cycles correctly, and only problem is overfills, then you have a bad water level switch or a bad membrane sensor (water level sensor).
If instead the machine get stuck on filling, and does not stop even if you advance timer, then the inlet valve is stuck on open, or the control board is faulty.
If machine is only two years old, call manufacturer and complain, even id limited warranty is one year, they may cover the part cost the same if they decide this was a factory defect (if it is inlet valve) coming up after two years.
While it is filling up try this. Unplug the washer from the wall, if the water still runs then you need to replace the mixing valve. If the water stops then take the screws out at the base of the console and flip the controls back. Look for the clear hose that goes to the water pressure switch and make sure that it is connected. If it is connected take it off the switch and blow through it to see that it is clear of any obstructions.
If this only overfills after the first ore second wash then you may have the slow drain and the drain hose is in the downspout too tight.
Possible items needed;
#1 mixing valve
#2 pressure switch
A defective pressure switch can interfere with the cycles that depend upon the switch to indicate when water has filled or emptied from the tub. It can also result in underfilling or overfilling of the tub. The switch routes current from the timer control to the temperature switch and the water inlet valve when the tub needs to be filled. Once full, the pressure switch cuts the current and reroutes it to the motor on the timer control to continue the cycle.