The fill cycle on your washer is controlled by the pressure switch. That's the component inside the console that has a (either rubber, or clear vinyl) hose attached to it. Its function is to respond to the air pressure associated with water filling the tub, by closing a set of electrical contacts and allowing the machine to go into the wash mode. If the air hose becomes clogged with debris or lint, the signal won't reach the timer, and the machine can overfill.
To determine whether this is the cause of your problem, set your machine on the smallest load setting and watch the fill. As the water exceeds the level you're accustomed to, unplug, or turn off the machine. If it stops filling, the problem is probably a clogged air hose. Disconnect it from the switch and blow through it until you can hear air going through (make sure you drain the machine, first). If it continues to fill after the power is disconnected, the problem is not with the level switch, or the air hose; instead, it's fouled water valve.
The water works by opening and closing by solenoids (one solenoid for each water temperature). When sediment from the cod water accumulates in the valve's inlet, it can foul the valve seat, and it will stop closing all the way. If it gets bad enough, it can cause a flood.
There's really no good way to clean a fouled water valve. It will have to be replaced.
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