Most of the time it's because the
impeller assembly has either something stuck in it or has just plain worn out.
Also you want to check and make sure the holes in the washing arms are clear (Poke a little toothpick threw them, or small
piece of wire/nedel ect).
To get access to the
impeller, involves unhooking the power, water and drain line.
Turn the entire unit upside down and remove the plastic
impeller, which there is a kit that can be purchased at most local appliance parts suppliers with the model and serial of the unit, to
replace just the inner working parts of the
impeller assembly.
Just think like a dishwasher and where does the water come from and follow all the pipes and be observant to how it is getting to the washer arms.
Good Luck!
FlaTech
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