When the machine is overfilling , it means that there is a problem with the inlet valve (valve not closing) or with the water level switch, that should turn off the valve when water reaches level.
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It's overfilling at repairclinic:
It's overfilling
If your washer is overfilling, check these:
Water-inlet valveWater-level switch
Water-inlet valve
A
defect in the water-inlet valve may mean that it's no longer able to
shut off completely when the electricity has been turned off to it. If
this occurs, the valve may leak and drip water into the clothes tub. In
time, the water may accumulate substantially. If this happens, you need
to replace the valve.
Water-level switch
A
defect--or an obstruction--in the water-level switch may mean that it
can't tell the water to shut off. So the machine overflows. This switch
senses the water level in the clothes tub. It's 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. You can
either clear any obstruction in the tube or replace the water-level
switch.
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