Water filling the tub does not shut off and washer does not go into wash mode.

if you are saying that the washer finishes the load of clothes and timer goes to off and water is filling the tub after this then you have a bad water valve on the back of the washer.disconnect the water lines and change out the valve

Does your washer constantly attempt to fill and never does? Or, does the washer continue to fill and overflow?

If the washer is constantly trying to fill, but your water level does not change, you may have a condition known as siphoning. Siphoning occurs when you don't have a proper air gap on the drain line and the washer will actually drain as it attempts to fill. The following link explains:

http://www.fixya.com/support/r3575830-how_to_prevent_washer_siphoning

If your washer fills, won't shut off and then overflows, this is caused by either a pressure switch malfuction, or a water inlet valve that won't shut off. The following link explains how to diagnose the problem:

http://www.fixya.com/support/r3753517-whirlpool_top_load_washer_fills_when_not

I know the link is for a problem where the washer continues to fill even when it is not in use, but this problem occurs while the washer is running as well. The method of determing the cause is the same. In many cases, an overflow problem is caused by the air hose slipping off the pressure switch. Without the air hose, the pressure switch never detects the pressure differntial from the wash tub as it fills and won't shut off.

Read through the links provided and let me know if you have any questions. If the conditions I have described do not match your symptoms, please post back and elaborate a bit more so I can help you determine the source of the problem. Please include your complete MODEL NUMBER. I hope you find this information helpful.

You have a bad water fill valve. Until you get it fixed shut water valves off at the wall so that you don't have a flood if the fill valve on the machine fails completely. Let me know if there is anything else I can Help you with.
Ken

The water-level switch regulates your washer's fill volume. This switch is usually a diaphragm device with a small, clear tube attached between the switch and the bottom of the washer's outer tub. As the water level in the tub increases, the pressure on the air in the tube increases. When the pressure reaches a certain level, it activates the switch, shuts off the water, and signals the timer to begin the agitate cycle. If the switch is defective, it may prematurely signal the water to shut off. If so, you probably need to replace the water-level switch.

This machine has a water valve that works on vaccuum from the tub. You will see a small clear hose that runs from the side of the tub up to this valve. This valve is adjustable to change the water level in the tub to desired setting on some machines, but if it goes bad, it will not shut off, thus overflowing the tub. Find this valve and replace it if adjustment does not work.

you looking for a new water valve assembly...not very hard to replace..maybe a lil' messy

I fixed it by buying a new LG washer.....

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.

1st I checked the power, compressor in garage had tripped the breaker to the washer circuit. This model has no bells or whistles to tell you if the power is on to the unit. Reset the breaker and unit works.
Thanks FixYa

the water is draining back to the ocean. The drain hose was not emptied properly from its last use. Put the machine in spin cycle (about 5 minutes) only to spin out the water from the outer tub completely and retry washer. If still problem, then visual check drain hose that it still has a "rising" section higher in altitude than the water level of inner tub (when working properly) before it makes a U-turn downward to send back to the ocean. You can also test the drain hose by putting machine in fill mode and crimping off the hose (fold hose over) to simulate a good drain hose. At this test, you should not "feel" water running through the hose if successfully crimped.