The first thing you would want to check is your shut off valve located under the sink. Many times these will clog up with calcium deposits and give you low water pressure. To clean the valve you can shut the water off to the house and run your sink leaving the sink open until no water is flowing through. Then remove the dishwasher fill line and clean the valve with a brush or pipe cleaner. You could also go as far as removing the valve completely and cleaning it that way. This will usually solve the issue. The other possibility would be your inlet valve itself is gunked up in which case its best to just replace the valve.
Washers have a (vacum pipe) that feeds a micro switch. The air pressure in the vacume pipe caused by the water filling the washer activates a vacum switch when the correct amount of water has entered the machiene. This vacum pipe could be partly blocked or the vacume pressure switch contacts burnt of faulty. This can be tested by physicaly blowing air by mouth into the pipe and you should hear the switch click.
SOURCE: Not enough water is dispensed during fill cycle.
First check that the fill float switch is working.
Next that the fill valve doesn't have crud that limits water flow. They MAY have a timeout to prevent overfilling if fill is too slow and that could cause the priblem if fill valve is partially blocked.
SOURCE: NOT ENOUGH WATER FILLING UP IN WASHER. EVERYTHING
the presostat or whater level sensor is not good
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