There's a few things you can look into that won't cost you any money.
First, manually remove as much water as possible and then check the
sump area for paper or any other large object clogging the drain. A cup
or so of water in the sump area of your dishwasher is normal and it is
there to prevent the seals from drying out. The dishwasher will pump
this old water out before beginning to wash.
Make sure the door is properly latched as the pump will not drain if the door is not latched properly.
Check the belt, drain line, air gap, drain valve and solenoid assembly,
the motor, and the pump. If your dishwasher uses a belt to drive the
pump, and it has broken or come off the pulley, replace it.
If you have recently installed a garbage disposer in your home, make
sure that the drain plug on the disposer has been removed. It's just a
little plastic piece that blocks the hole where you hook the dishwasher
drain hose. If your dishwasher drains through the garbage disposer, you
need to run the garbage disposer before you run the dishwasher to make
sure that the drain is clear.
There is a drain hose between the drain valve or pump and the garbage
disposal or drain line. If an obstruction has blocked this, then your
dishwasher won't drain. The drain hose is connected by clamps to the
drain valve and the disposer or drain pipe. Remove it and visually
inspect it for a clog or a kink. Try to remove any debris. If it is in
good condition, just put it back on, and if not, purchase a new one to
install.
If you don't have an air gap in the drain line, at least use a high
drain loop. Making a large loop about 18" off the ground with the drain
line can prevent any back flow into the dishwasher from the sink.
If you have one, the air gap will be located on top of the sink. The
air gap is there to prevent any siphoning of standing water from the
sink. When your dishwasher drains, the air gap diaphragm will form a
seal and allow the water to drain properly. If the diaphragm in the air
gap is faulty, it’s possible that water can leak onto the cabinet and
into the sink area. When this happens, then the air gap must be
replaced.
Like the inlet valve, there is also a drain valve on most models. When
no power goes to the drain valve it remains closed and prevents water
from leaving the machine. When the valve receives power during the
drain cycle, the solenoid opens and allows the water to leave the
machine. If your drain hose is attached directly to the pump, you don't
have a drain valve. The motor simply reverses and the pump sends the
water in the opposite direction, which is out of the machine.
If the motor doesn’t turn or work properly, the dishwasher may not
drain. Make sure you have power to the unit. If you notice that the
motor hums but won't turn, it could be seized, and you probably need to
replace it.
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Small objects can sometimes get stuck in the pump. When this occurs,
you’ll need to open the pump and remove any debris buildup. The
dishwasher pump is usually mounted directly to the motor and runs off
the motor as well. The pump is also attached to the bottom of your
dishwasher and pushes the water from the dishwasher.
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