Whirlpool DU920QWDQ4 Use And Care Manual page 26

PROBLEM CAUSE SOLUTION
Spotting and Use of incorrect
filming detergents
(continued) Incorrect amount
of detergent
Use of ineffective
detergents
Insufficient fill due to
low water pressure
Cycle takes Water temperature
extremely is too low
long time
Dishes do not
dry completely
Silica film or
etching
(silica film is a
white iridescent
deposit; etching
is a cloudy film)
Black or gray
marks on dishes
Dishwasher is not
installed properly
Dishes do not drain
properly
Plastics
Use recommended dishwasher detergents
only.
See the "Using the Dispensers" section for
amount. Heavy soil and/or hard water
generally require extra detergent.
Use fresh detergent. Store detergent tightly
closed in a cool, dry place. Discard lumpy
detergent.
Home water pressure should be 20 to
120 psi for proper dishwasher fill. A booster
pump on the water supply may be neces-
sary if pressure is too low.
If needed, turn home water heater up
to ensure water entering dishwasher is
120°F (49°C) minimum. See the "To check
water temperature" section.
Undercounter dishwashers require
adequate enclosure for proper operation.
See the Installation Instructions for com-
plete information.
Dishes must have proper water drainage.
Do not overload. Follow instructions for the
"Troubleshooting" section. Use a liquid rinse
agent to speed draining.
Some plastics, due to material, may need to
be towel dried.
Water chemical
reaction with certain
types of glassware -
usually caused by
some combination of
soft or softened water,
alkaline washing
solutions, insufficient
rinsing, overloading
the dishwasher, and
heat of drying.
Aluminum items
touching dishes
It may not be possible to prevent problem,
except by hand washing. To slow this
process, use a minimum amount of deter-
gent but not less than 1 tablespoon per
load. Use a liquid rinse agent and under-
load the dishwasher to allow thorough
rinsing. Silica film and etching are perma-
nent and cannot be removed. Use the Air
Dry option.
Load aluminum items so that they will not
rub against dishes during washing. Do not
wash throwaway aluminum items in the
dishwasher because they may break down
and cause marking. Remove aluminum
markings by using a mild abrasive cleanser.
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