Whirlpool WDF520PADW User Instructions page 16

Dishes are not completely clean
Food soil left on the dishes
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Is the dishwasher loaded correctly?
Check and clean your filters regularly. See the table in "Filtration
System" section for "Recommended Time Interval to Clean
Your Filter."
Did you choose the cycle that describes the most difficult soil
in your dishwasher? If you have some items with heavier soils,
use a heavier cycle.
Is the water temperature too low? For best dishwashing results,
water should be 120°F (49°C) as it enters the dishwasher.
Did you use the correct amount of fresh detergent? Use
recommended dishwasher detergents only. Do not use less
than 1 tbs (15 g) per load. Detergent must be fresh to be
effective. Heavy soil and/or hard water generally require extra
detergent.
Is detergent caked in dispenser? Use fresh detergent only. Do
not allow detergent to sit for several hours in a wet dispenser.
Clean dispenser when caked detergent is present.
Is the pump or spray arm clogged by labels from bottles and
cans?
Is the home water pressure high enough for proper dishwasher
filling? Home water pressure should be 20 to 120 psi (138 to
828 kPa) for proper dishwasher fill. If you have questions about
your water pressure, call a licensed, qualified plumber.
Are high suds slowing the wash arm? Do not use soap
or laundry detergents. Use recommended dishwasher
detergents only.
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Dishes are damaged during a cycle
Chipping of dishes
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Did you load the dishwasher properly? Load the dishes and
glasses so they are stable and do not strike together from
washing action. Minimize chipping by moving the rack in and
out slowly.
NOTE: Antiques, feather-edged crystal, and similar types
of china and glassware might be too delicate for automatic
dishwashing. Wash by hand.