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Service Manual - Dishwasher Models DDW24S, RDW24I and RDW24S
Circulation Pump
• The circulation pump
comprises an asyn-
chronous motor with a
capacitor and a pump
housing with an impeller.
The impeller and seals
cannot be replaced sep-
arately, rather the entire
pump must be replaced.
• Purpose: To provide the
spray system with the
water pressure necessary for the dishwashing process.
Heating Element
• The heating element is
of the flow-through type
and is fitted between
the bottom drain and
the suction connector of
the circulation pump. It
comprises a pipe with a
heating coil. One side
of the heating coil is fit-
ted with an overheating
cut-out with a trigger
temperature of 98°C (208°F) and an automatic reset.
The other side is fitted with a safety fuse that blows at
229°C (444°F). The element is replaced from the rear
of the machine by first moving the circulation pump out
of the way.
• Purpose: To heat the dishwater to the correct tempera-
ture during the prewash/main wash and final rinse.
Drain Pump
• The drain pump is fitted
to the bottom drain and
can be replaced from the
front of the machine. In
the bottom drain, under
the filters, is a clean-
ing plug which when
removed enables the
customer to clean the
pump housing. In the
event of a blockage the
pump changes its direc-
tion of rotation to try to
clear the blockage.
• Purpose: To drain the water from the cleaning compart-
ment in accordance with the program specification and
in case of overflow.
Components Descriptions
Detergent and Rinse Aid Dispenser
• The dispenser has one container for detergent and
one container for rinse aid. The containers are opened
by activating the electromagnet found on the lock of
each container. When first activated detergent is dis-
pensed and when activated a second time rinse aid is
dispensed. A weight (which is activated when the door
is opened for loading and unloading) resets the mecha-
nism so that the dispenser always dispenses detergent
first when a new program is started.
Fan (RDW Series Only)
• The fan is fitted to the top
edge of the inner door and
comprises a fan motor, a
fan housing, a venting duct,
a double-sided impeller, a
damper and a Wax motor
that controls the damper
function. The fan works
throughout most of the dish-
washing program in order
to reduce the formation of
condensation between the
machine’s inner and outer
doors and to eliminate con-
densation between the outer
door and the cover door on fully integrated machines.
During the drying program the fan sucks in cold, dry air
from outside via the duct in order to cool it. The Wax
motor opens the damper slowly allowing the fan to suck
in the hot, damp air from the cleaning compartment.
The two air flows are mixed in the duct where the mois-
ture condenses into water that is routed into the clean-
ing compartment. The air is vented through a nozzle
under the outer door.
• Purpose: To vent the hot, damp air from the cleaning
compartment so that the dishes dry during the drying
program and to prevent condensation forming between
the machine’s inner and outer doors.
Circulation Pump
Drain Pump
Fan
Heating Element
Detergent-Rinse Aid Dispenser